Search Results: "reflection math"

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07:14
Content Changes To The New SAT | Tips & Planning | New SAT | Khan Academy

648 views / 0 likes - added 9 years ago

Sal covers the major content changes to the new SAT. Watch the next lesson: https://www.khanacademy.org/test-prep/new-sat/new-sat-tips-planning/new-sat-about-sat/v/sat-math-test-intro?utm_source=YT&utm_medium=Desc&utm_campaign=NewSAT Missed the previous l
09:44 Popular
How to Measure Wavelength of Light with a Meter Stick - The Science of Light with Mr. G - Part 2

1,249 views / 0 likes - added 5 years ago

**WARNING: This video contains math. Math has been known to cause great anxiety and even scare people. Please watch this video at your own risk. Or, just be brave and learn something new today! ~Craig Beals and Glenn Govertsen from the Mr. G Science Show
06:05
Could These Numbers Unravel New Dimensions in Space?

407 views / 1 likes - added 5 years ago

These multidimensional number systems are helping us explain the laws of nature. Here’s how. Can Hawking’s Black Hole Paradox Be Solved With Fuzzballs? - https://youtu.be/esPa1tVSjew Read More: The Peculiar Math That Could Underlie The Laws of Nature http
02:07 Popular
Percentage Of A Whole Number | Decimals | Pre-Algebra | Khan Academy

1,532 views / 0 likes - added 8 years ago

We hope you're beginning to see that there's more than one way to skin a cat. In other words, there are several different ways to solve problems involving percentages, decimals, and fractions. Watch as find the percentage of a whole number. Watch the next
06:47 Popular
Noble Gas Configuration | Electronic Structure Of Atoms | Chemistry | Khan Academy

1,490 views / 0 likes - added 8 years ago

How to write electron configurations for atoms and monatomic ions using noble gas configuration Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity
06:47 Popular
Noble gas configuration

782 views / 0 likes - added 6 years ago

How to write electron configurations for atoms and monatomic ions using noble gas configuration Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity
08:27
Can You Solve The 3 Cards Riddle?

681 views / 0 likes - added 7 years ago

There are 3 cards in this problem. One card is blue on both sides, another is red on both sides, and the last is red on one side and blue on the other. The cards are put in a bag and I pick one at random. Without looking at the colors on the card, I place
16:49
Dimensional Analysis 3: Examples and Practice for Converting Units

430 views / 0 likes - added 5 years ago

Craig Beals continues his explanation of dimensional analysis with some simple practice problems. Dimensional analysis is one of the most important science-math topics because it is usable in every aspect of science.
03:31 Popular
How Logical Are You? The Irrationality Illusion Tricks Most

805 views / 0 likes - added 7 years ago

This video relates a cognitive bias ("irrational" decision) to an optical illusion (picture at 1:45). For more, check out my new book, "The Irrationality Illusion: How to Make Smart Decisions And Overcome Bias" http://amzn.to/1o3FaAg Blog post (text and i
09:44
The 50/50 Problem You Won't Believe

206 views / 0 likes - added 2 years ago

Get the Vsauce Curiosity Box: https://www.curiositybox.com/vsauce2Probability is one of the clearest, more straightforward disciplines within mathematics. Unfortunately, almost nothing in mathematics is murkier and more misleading than probability. WHAT?!
04:22 Popular
Calculus Limits - Factoring Example

1,430 views / 0 likes - added 7 years ago

Learning Calculus limits is a breeze with this tutorial and video example.. This example teaches you how to solve limits by factoring. Check out my Calculus limits playlist if you want some harder examples. I also offer live tutoring if you need any extra
04:30 Popular
Calculus Limits - Easy Problem and Introduction

1,257 views / 0 likes - added 7 years ago

Learning Calculus limits is a breeze with this problem and introduction. This example is an easy problem. Check out my Calculus limits playlist if you want some harder examples. I also offer live tutoring if you need any extra help. Check out my website i
08:13 Popular
What Does It Look Like INSIDE a Spherical Mirror?

1,042 views / 0 likes - added 3 years ago

In this video I put a small camera inside a real spherical mirror in order to show what it looks like. Does the light reflect forever? What does the reflection look like? Watch the amazing properties of spherical mirrors in this amazing video.Get Your Exp
00:40 Popular
Sesame Street: "Elmo the Musical" Preview

888 views / 0 likes - added 9 years ago

Elmo stars in his very own musical, using his math skills to solve problems and save the day. Kids can sing, dance, play, and imagine along with Elmo on these math-filled adventures. You can find the Elmo the Musical DVD here: http://store.sesamestreet.or
01:53 Popular
How to Divide Fractions

882 views / 0 likes - added 5 years ago

Watch more Basic Math Skills videos: http://www.howcast.com/videos/262765-How-to-Divide-Fractions Math can be scary, but don't give up. Follow these simple steps, and soon you'll be dividing fractions like a pro. Step 1: Write the problem Write out the fi
10:43
How To Draw Ski Goggles Self-Portrait

49 views / 0 likes - added 4 months ago

Yay! Today, Austin and I are learning how to draw ski goggles and a self-portrait! This isn't just any drawing lesson; it's a unique way to transform your love for art and winter sports into a personalized art project.Grab your Art For Kids Hub markers an
02:45 Popular
The Day After Tomorrow Is Yesterday Riddle. Can You Solve It?

710 views / 0 likes - added 7 years ago

This puzzle is popular on Facebook and many other sites. "When the day after tomorrow is yesterday, then today will be as far from Wednesday as today was from Wednesday when the day before yesterday was tomorrow. What day is today?" Can you solve this tri
08:39
Frog Jumping - Numberphile

636 views / 0 likes - added 6 years ago

Featuring Gordon Hamilton from Math Pickle. More links below. Numberphile T-Shirts: https://teespring.com/stores/numberphile Gordon and the Mondrian Art Problem: https://youtu.be/49KvZrioFB0 Math Pickle (Gordon's website): http://mathpickle.com Numberphil
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Can You Solve This Intelligence Test? Viral Facebook Puzzle

743 views / 0 likes - added 7 years ago

If 6 + 4 = 210, and 9 + 2 = 711, what is the rule to combine numbers? This "intelligence test" has been shared more than 3 million times on Facebook. On Twitter people claim solving it means you have an IQ of more than 150 (genius level). In this video I
03:21 Popular
Can You Solve A Puzzle That Fooled Richard Feynman?

711 views / 0 likes - added 5 years ago

What is the radius of the circle, in simplest terms involving a, b, and c? I read that even the great mind Richard Feynman made a mistake. Watch the video to learn the common mistake and what the correct answer is. Source Feynman story http://web.media.mi
05:09 Popular
Can You Solve The Snake Eyes Probability Riddle?

844 views / 0 likes - added 7 years ago

You close your eyes and roll a pair of dice. The casino dealer announces that at least one of the rolls is showing a 1.What is the probability that both dice are showing a 1? Watch the video for the solution. (Snake eyes is a term for rolling a pair of 1s
03:13 Popular
Will You Survive the Zombie Apocalypse?! | NUMBER CRUSHERS

830 views / 1 likes - added 5 years ago

Will You Survive the Zombie Apocalypse?! Math-Wiz Izzy challenges you to solve this undead brain teaser! Will Jon wake up before the Zombie strikes? Will Gary sink into quicksand before his friend can save him? Take a guess or do the math to know what hap
13:56
What Happens to Lasers Underwater? - Smarter Every Day 219

435 views / 0 likes - added 4 years ago

Original Video on 2nd Channel: https://www.youtube.com/watch?v=zh1E3TbBF1YGet your 1st Audiobook + 2 Audible Originals Free when you try Audible for 30 days: https://www.audible.com/smarter or text "smarter" to 500 500 Click below for more links! ~~~~~~~~
06:57
When Is Christmas? Mentally Convert Date To Day Of The Week

532 views / 0 likes - added 7 years ago

January 1, 2016 is a Friday. When will Christmas be in 2016? What about Christmas in 2055? You can do this in your head! Blog post (text explanation): http://wp.me/p6aMk-4qQ Doomsday Rule (previous video): https://www.youtube.com/watch?v=UsStBxY9STw Calcu
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The most significant genius: Emmy Noether

341 views / 0 likes - added 5 years ago

There are a few people in the history of physics who have made insights that have revolutionized our understanding of the interactions of math and physics and given us real insights into the meaning of our theories. In this video, Fermilab’s Dr. Don Linco
10:09
Base Neutral Multiplication

327 views / 0 likes - added 4 years ago

Math enthusiast Baron Hansz has described an terrific way to perform long multiplication in any base you like -- even fractional ones -- with absolute ease! He brilliantly combines the area model with Exploding Dots thinking. This video bounces of his vid
03:49 Popular
Meet The Prepositions | Prepositions | The Parts Of Speech | Grammar

1,060 views / 1 likes - added 8 years ago

Prepositions help show us where things are in space and time. Practice this yourself on Khan Academy right now: http://www.khanacademy.org/the-preposition/e/meet-the-preposition Watch the next lesson: https://www.youtube.com/watch?v=96sojEZsKu8 The parts
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Can You Survive the Grasp of King Kong? | NUMBER CRUSHERS

650 views / 0 likes - added 5 years ago

Can You Survive the Grasp of King Kong? Number Pro Izzy challenges you to solve this larger-than-life math problem! Will Jon wake up before the Zombie strikes? Will Gary sink into quicksand before his friend can save him? Take a guess or do the math to kn
08:05 Popular
Can You Solve The Hardest Easy Geometry Problem?

1,274 views / 1 likes - added 7 years ago

In the figure, what is the value of angle x? This problem is known as Langley's Adventitious Angles. It is also known as the hardest easy geometry problem because it can be solved by elementary methods but it is notoriously difficult to work out. Can you
05:14 Popular
Intensifiers And Adverbs Of Degree | Modifiers | The Parts Of Speech

1,000 views / 0 likes - added 8 years ago

Words like 'very' and 'slightly' are examples of intensifiers and adverbs of degree. Here's how they work! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-modifier/e/intensifiers-and-adver
07:45 Popular
Introduction to chemistry

813 views / 0 likes - added 6 years ago

A big picture intro to chemistry and why it is fascinating. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a fir
01:51 Popular
Crossing The River - Brain Teaser

931 views / 0 likes - added 8 years ago

Try to solve this fun brain teaser. Cross the river with all of the zombies and humans. The boat can only fit two at a time. Also there can never be more zombies than humans. My name is Chris and my passion is to teach math. Learning should never be a str
03:16 Popular
Can You Solve This 8th Grade Geometry Problem? 75% Got The Wrong Answer

1,005 views / 0 likes - added 7 years ago

What is angle A in the star-shaped figure? This problem appeared on the 1999 AMC 8 test (intended for 8th grade students in the US). Approximately 75% of test-takers did not mark the correct response. Can you figure it out? Watch the video for a solution.
06:52 Popular
Introduction To Partial Pressure | Gases And Kinetic Molecular Theory | Chemistry | Khan Academy

1,641 views / 0 likes - added 8 years ago

Definition of partial pressure and Dalton's law of partial pressure. Example of calculating partial pressure of a gas in a mixture from the total pressure and partial pressure of the other gases in the mixture. Chemistry on Khan Academy: Did you know that
05:55 Popular
"Impossible" Logic Puzzle - How Many Liars Are At The Party?

814 views / 0 likes - added 7 years ago

A party has 100 people who are either liars are truth tellers. Liars always lie and truth tellers always say the truth. After the party you ask each person, "How many truth tellers did you shake hands with?" Each person gives a different answer from 0 to
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Don't Checkmate - Brain Teaser

790 views / 0 likes - added 8 years ago

Don't checkmate the black king. In this brain teaser you must find one move for white which will not result in immediate checkmate for the black king. I also have a bunch of other fun brain teasers as well. My name is Chris and my passion is to teach math
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Moving Faster Than The Speed Of Light? Special Relativity Velocity Addition Formula

687 views / 0 likes - added 7 years ago

If train A is moving towards train B, and each train moves at 75% the speed of light (relative to the ground), will an observer on train A think that train B is moving at 150% the speed of light? But nothing moves faster than the speed of light, so what i
04:53 Popular
Can You Solve The Friendship Riddle?

1,309 views / 0 likes - added 7 years ago

In a group of 6 people, you might find that some people are friends on Facebook, or you might find out that no one is friends on Facebook. Show that there is always a group of 3 people in which either: (a) all 3 people are mutual friends or (b) the 3 peop
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BONUS: History of the possessive apostrophe | The Apostrophe | Punctuation | Khan Academy

596 views / 0 likes - added 6 years ago

David, Paige, and Jake cover the fascinating history of the possessive apostrophe. Stay tuned for this bonus video! Missed the previous lesson? Watch here: https://www.khanacademy.org/humanities/grammar/punctuation/the-apostrophe/v/bonus-history-of-the-ap
02:37 Popular
Adults Stumped By Maths Questions For 15 Year Olds. Can You Solve Them?

800 views / 0 likes - added 7 years ago

How hard are math tests? A survey asked 2,000 UK adults to answer sample GCSE test questions intended for 15 year old students. On average, the survey questions were missed by about 40% of adults. Can you solve them? The video presents 2 questions that ma
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Can You Solve The Alien Extinction Riddle? Hard Job Interview Question

870 views / 0 likes - added 7 years ago

A single alien lands on Earth. Every day after that, each alien on Earth undergoes a transformation, which could be any of the four equally likely events: (a) the alien dies, (b) the alien does nothing, (c) the alien replicates itself (2 aliens total), (d
01:49 Popular
This Matchstick Puzzle Is

858 views / 1 likes - added 7 years ago

This classic matchstick/toothpick puzzle is making the rounds because it is supposedly "extremely hard" for adults. Can you make 3 squares by moving 3 matchsticks? You cannot break any of the sticks, the resulting squares must be of equal size, and each t
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05:09 Popular
Finding Units Of Rate Constant K

1,383 views / 0 likes - added 8 years ago

How to find the units for the rate constant k for a zero, first, or second order reaction. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. Thi
02:57 Popular
Can You Solve This Crazy Equation? Ramanujan's Radical Brain Teaser

1,099 views / 0 likes - added 7 years ago

In 1911, Srinivasa Ramanujan posed this problem involving an infinite nested radical (a never-ending expression that has square roots inside of square roots). Can you figure out how to simplify the equation? The video presents an intuitive solution. Techn
07:49 Popular
Can You Solve The Viral 9 = 72 Puzzle? The Correct Answer Explained

1,079 views / 0 likes - added 7 years ago

This problem has been shared millions of times on Twitter/Facebook with the claim "99% fail" to solve it and that only a genius could find the correct answer. If 9 = 72, 8 = 56, 7 = 42, 6 = 30, 5 = 20, then 3 = ? In this video I explain what many people b
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Can You Solve The Viral 1 + 4 = 5 Puzzle? The Correct Answer Explained

11.8k views / 1 likes - added 7 years ago

This problem was shared on Facebook with the claim that only one in a thousand could figure it out. It went viral and generated over 3 million comments. Here is the problem. If 1 + 4 = 5, 2 + 5 = 12, 3 + 6 = 21, what is 8 + 11 = ? This video presents what
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The Power of Mathematical Visualization | The Great Courses

1,076 views / 0 likes - added 7 years ago

https://www.thegreatcoursesplus.com/show/the_power_of_mathematical_visualization?utm_source=US_SocialMedia&utm_medium=SocialMediaEditorialYoutube&utm_campaign=138569 The Power of Mathematical Visualization teaches you these vital problem-solving skills in
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BONUS VIDEO | Terminal Prepositions | Prepositions | The Parts Of Speech

544 views / 0 likes - added 8 years ago

It's totally okay to end sentences with prepositions! David, Khan Academy's grammarian-in-chief, explains the history and the context behind this long-held grammar myth. Missed the previous lesson? Watch here: https://www.khanacademy.org/humanities/gramma
05:38 Popular
Prepositional Phrases | Prepositions | The Parts Of Speech | Grammar

742 views / 0 likes - added 8 years ago

Prepositional phrases are word chunks that begin with a preposition. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-preposition/e/prepositional-phrases/ Missed the previous lesson? https://www.khanacademy.org/the-preposi
07:47 Popular
Can You Solve The Probability The Newborn Is A Boy? Many Fail This Interview Question

828 views / 0 likes - added 7 years ago

This problem has been asked in job interviews. On the morning of January 1, a hospital nursery has 3 boys and some number of girls. That night, a woman gives birth to a child, and the child is placed in the nursery. On January 2, a statistician conducts a
11:26 Popular
10 Tricky Riddles and Logic Puzzles To Sharpen Your Brain

1,119 views / 3 likes - added 5 years ago

If you are a Genius, can you solve this puzzle? So, test your ingenuity and knowledge with these top 10 amazing riddles and puzzles that 90% fail to answer. Subscribe to FactoFusion: http://bit.ly/FactoFusion Our Social Media: Like us on Facebook: https:/
00:52 Popular
Sesame Street:“Elmo The Musical – Volume 2” Preview

824 views / 0 likes - added 9 years ago

It’s volume two of Elmo’s math-filled musicals, packed with 7 all-new to DVD episodes! With over two hours of music, adventure, math, friendship and fun, little learners will love to sing along! Includes a bonus full-length video of “Play With Me Sesame:
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Introduction To Agreement | Verbs | The Parts Of Speech

793 views / 0 likes - added 8 years ago

When you match up the subject of a sentence with a verb, it's called 'agreement'. Here's how it works! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/e/intro-to-verb-agreement M
07:37
Introduction to reaction quotient Qc | Chemical equilibrium | Chemistry | Khan Academy

653 views / 0 likes - added 6 years ago

Introduction to the reaction quotient Qc, and how to use the reaction quotient to predict how the reaction concentrations will change. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its
07:25 Popular
Can You Solve The Race To December 31 Riddle?

717 views / 0 likes - added 7 years ago

Here's a fun game you can play with another person. The game starts on January 1. Each of two players takes turns calling out another date. The new date has to be a later date in the year with either the same month OR the same day (from January 1, a playe
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Conjugate acid-base pairs | Acids and bases | Chemistry | Khan Academy

589 views / 0 likes - added 6 years ago

Introduction to conjugate acid-base pairs. Definition and examples of conjugate acid-base pairs. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivit
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The Number Illusion You Won't Believe

278 views / 0 likes - added 3 years ago

Watch my newest video, "Could a Toothpaste Sandwich Brush Your Teeth?": https://youtu.be/OdeiWhETqQYSometimes math is so beautifully tricky, and presented in such a subtle way, that its virtually indistinguishable from magic. Welcome to The Kruskal Count.
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Prepositions Of Neither Space Nor Time | Prepositions | The Parts Of Speech | Grammar

921 views / 0 likes - added 8 years ago

Some prepositions describe relationships between people or things. These prepositions don’t include information about time or space. Watch the next lesson: https://www.khanacademy.org/the-preposition/e/common-prepositions Missed the previous lesson? Watch
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How to use italics and underlines | Punctuation | Khan Academy

571 views / 0 likes - added 6 years ago

Learn how to use italics and underlines when writing the titles of works or when emphasizing a particular word or phrase. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/italics--underlines--and-qu
02:26 Popular
How Close Are We To Computers That Think Like Humans?

839 views / 0 likes - added 8 years ago

Computers can do a lot, but when will they be able to think like humans? Help support DNews by completing this one-question survey http://bit.ly/dnewssurvey The Science of Surfboards ►►►► http://dne.ws/1MSpqJV Read More: New Brain-Like Computer May Solve
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07:36 Popular
Fractions - Adding and Subtracting

732 views / 0 likes - added 8 years ago

Fractions - Adding and Subtracting. Examples involving both numerical and variable expressions and shown! For more free math videos, visit http://JustMathTutoring.com
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Ellipses | Punctuation | Khan Academy

677 views / 0 likes - added 6 years ago

Ellipses are three little dots that we use to show a pause or that a portion of a quote has been removed. Learn how to use them in this video. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/introd
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How to Multiply With Parentheses

432 views / 0 likes - added 5 years ago

How to Multiply With Parentheses. Part of the series: Math Help With Multiplying. Multiplying with parenthesis requires you to do things in a very specific order. Find out about multiplying with parenthesis with help from a mathematics educator in this fr
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Infinite Series - Numberphile

481 views / 0 likes - added 5 years ago

Fields Medallist Charlie Fefferman talks about some classic infinite series. More links & stuff in full description below ↓↓↓ Charles Fefferman at Princeton: https://www.math.princeton.edu/people/charles-fefferman Numberphile is supported by the Mathemati
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Can YOU Solve It? This Question Stumped 75% Of PhD Economists

610 views / 0 likes - added 7 years ago

Introductory economics courses cover the concept of an opportunity cost. Can you figure out the opportunity cost for the problem in the video? This video presents a question that surprisingly more than 75% of PhD economists did not answer correctly. Paper
02:04 Popular
Guess The Diagonal - Brain Teaser

1,096 views / 0 likes - added 8 years ago

Try to solve this brain teaser in less than a minute. You must guess the diagonal inside of the circle. There is enough information given which allows you to find the length of the diagonal in less than a minute. My name is Chris and my passion is to teac
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Introduction to the apostrophe | The Apostrophe | Punctuation | Khan Academy

608 views / 0 likes - added 6 years ago

David and Paige, KA’s resident grammarians, introduce a new piece of punctuation: the apostrophe! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-comma/e/introduction-to-the-apostrophe Watch the next lesson: https://www.k
09:11 Popular
Can You Solve The Rectangle Ratio Puzzle? The Surprising Answer

855 views / 0 likes - added 7 years ago

Start with a unit square (a rectangle with both sides equal to 1, call it R1). Attach a rectangle of area 1 to its right side, then attach a rectangle of area 1 to its top. The border of this new shape is another rectangle, call it R2. We can repeat the p
03:48 Popular
Can You Solve This Harvard Admissions Question? Algebra Problem, 1869

1,478 views / 0 likes - added 7 years ago

The Harvard admissions exam in 1869 included this algebra problem: "A man bought a watch, a chain, and a locket for $216. The watch and locket together cost three times as much as the chain, and the chain and locket together cost half as much as the watch
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4 Common Misconceptions About A.I.

513 views / 0 likes - added 6 years ago

4 big misconceptions about artificial intelligence (A.I.), machines and superintelligence. A lot of this video was based on a chapter of the book "Life 3.0" by Max Tegmark. 1:19 - 1. The Risk of a Robot Take-Over 3:57 - 2. We Should Be Worried About Machi
05:57 Popular
Can You Solve This 6th Grade Geometry Problem From Singapore? The Area Of A "Claw"

1,131 views / 1 likes - added 7 years ago

This problem was given to Primary 6 (age 11-12) students in Singapore. What is the area of the shaded region in the video, which consists of the region bounded by 4 quarter circles in a 3x3 grid of squares, and each square has a side length of 4? The shad
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How big is infinity? - Dennis Wildfogel

482 views / 0 likes - added 6 years ago

View full lesson: http://ed.ted.com/lessons/how-big-is-infinity Using the fundamentals of set theory, explore the mind-bending concept of the "infinity of infinities" -- and how it led mathematicians to conclude that math itself contains unanswerable ques
03:51 Popular
Can You Solve This MIT Admissions Question? Geometry Problem, 1869

951 views / 0 likes - added 7 years ago

The Massachusetts Institute of Technology (MIT) is one of the top ranked universities in the world. This question appeared on its admissions exam nearly 150 years ago. "The perpendicular dropped from the vertex of the right angle upon the hypotenuse divid
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Can You Solve The Missing Sock Puzzle?

619 views / 0 likes - added 7 years ago

A statistician keeps a simple wardrobe. He only purchases pairs of black socks and white socks, and he keeps all of the socks in a pile in the drawer. Recently one of the socks was lost in the laundry. The socks have a mathematical property. If you select
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Beginning sentences with conjunctions | The parts of speech | Grammar | Khan Academy

787 views / 0 likes - added 6 years ago

Is it okay to begin a sentence with a conjunction like "but" or "because"? Yes. David explains why. Missed the previous lesson? https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/v/correlative-conjunctions?utm_source=YT&utm_medium=D
01:32 Popular
How to Solve for the Height of Cylinders

788 views / 0 likes - added 5 years ago

How to Solve for the Height of Cylinders. Part of the series: Algebra Tips. Solving for the height of cylinders can be accomplished in just a few moments with the right equation. Learn how to solve for the height of cylinders with help from an experienced
02:51 Popular
The Horse Horseshoe Boots Viral Algebra Problem - The Correct Answer Explained

1,728 views / 2 likes - added 7 years ago

A lot of people are arguing over the correct answer to this algebra problem involving horses, horseshoes, and boots. A Facebook post with this problem has over 500,000 comments. Can you figure it out? In this video I explain the correct answer. Blog post:
11:27 Popular
Can You Solve The Viral 11x11 = 4 Puzzle? The Correct Answer Explained

3,056 views / 1 likes - added 7 years ago

If 11x11=4 and 22x22=16, what is 33x33=? This puzzle has been shared with the claim that only geniuses can solve it. It has gotten millions of views on the internet and Facebook as people have debated the correct answer. In this video I present what many
05:26
Can You Solve The Red Ball Lottery Puzzle?

673 views / 0 likes - added 7 years ago

(Same video without the music: https://youtu.be/sz5oLEpc8xE) This problem involves 100 red balls, 100 blue balls, and 2 urns. First you distribute all the balls between the 2 urns, placing at least 1 ball in each urn. Next, you select an urn at random, an
07:21 Popular
Can You Solve The Magical Pond Puzzle?

1,037 views / 1 likes - added 7 years ago

(Same video with music: https://youtu.be/nF-Gpk0ZpRk) You visit a shrine that has 3 temples. Before each temple, you have to swim in a magical pond. Your path is pond-temple1-pond-temple2-pond-temple 3. Each time you swim, the pond magically triples the n
07:48 Popular
Introduction To The SAT Writing & Language Test | Tips & Planning | New SAT | Khan Academy

770 views / 0 likes - added 8 years ago

This is the last video in our New SAT subject! Missed the previous lesson? https://www.khanacademy.org/test-prep/new-sat/new-sat-tips-planning/new-sat-about-sat/v/sat-reading-test-intro?utm_source=YT&utm_medium=Desc&utm_campaign=NewSAT New SAT (starting M
04:51 Popular
Hyphens vs. dashes | Punctuation | Khan Academy

843 views / 1 likes - added 6 years ago

Hyphens and dashes look pretty similar, but their uses are very different! Learn when to use each one in this video. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/dashes-and-hyphens Watch the nex
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Can You Solve The Marriage Logic Problem? 80% Fail

680 views / 0 likes - added 7 years ago

Surveys have found 80 percent get this logic problem wrong. Alice is looking at Bob, and Bob is looking at Charlie. Alice is married; Charlie is not. Is a married person looking at an unmarried person? Answer choices are A) Yes, B) No, and C) Cannot be de
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Dividing a Number by a Larger Number : Fractions/ Decimals / Percents

1,092 views / 1 likes - added 8 years ago

Dividing a Number by a Larger Number : Fractions/ Decimals / Percents. In this video, I show how to divide: 9 / (48) by making this number into a decimal and then into a percentage. For more free math videos, visithttp://justmathtutoring.com/
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04:13 Popular
Can You Solve This Grade 12 Geometry Problem From Australia? The Marshmallow Chocolate Puzzle

911 views / 0 likes - added 7 years ago

A marshmallow has the shape of a cylinder with diameter 5 and height 3. A dessert is made with 24 marshmallows: there are two stacked layers of marshmallows, and each layer has 3 rows of 4 marshmallows. The gaps between the marshmallows are filled with ch
07:50 Popular
Compound Prepositions | Prepositions | The Parts Of Speech | Grammar

965 views / 0 likes - added 8 years ago

These prepositions are called compound prepositions, or multisyllabic prepositions. Like most prepositions, they have both literal and figurative meanings. David explains. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech
04:18 Popular
Long Division of Numbers - Arithmetic Basics, Ex 2

2,479 views / 1 likes - added 8 years ago

Example 3: https://www.youtube.com/watch?v=pP4VWFGMHNg Long Division of Numbers - Arithmetic Basics, Ex 2. In this video, I show how to make a fraction into a decimal doing long division. For more free math videos, visit http://PatrickJMT.com
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02:41 Popular
Trick Question - True or False

875 views / 0 likes - added 7 years ago

Think you can answer this simple trick question? Does .9 repeating equal 1? Find the solution in this video. My name is Chris and my passion is to teach math. Learning should never be a struggle which is why I make all my videos as simple and fun as possi
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05:33 Popular
What is 6÷2(1+2) = ? The Correct Answer Explained

886 views / 0 likes - added 7 years ago

What is 6÷2(1+2) = ? This problem went viral and generated millions of comments on Facebook, Twitter, YouTube and social media sites. I explain how to get the correct answer by using the modern interpretation of the order of operations. I also explain how
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03:54 Popular
What's The Best Soup Can Size? The Optimal Cylinder Puzzle

802 views / 0 likes - added 7 years ago

A cylindrical can with volume V can be made in different ways. The cylinder can be wide and short (large radius and small height), or it can be narrower and taller (small radius and larger height). Which shape uses the least material? That is, which can h
08:44
What is a Singularity, Exactly?

672 views / 1 likes - added 6 years ago

What is a Singularity? Find out what black holes have to do with the AI explosion. Hi! I'm Jade. Subscribe to Up and Atom for new physics, math and computer science videos every week! *SUBSCRIBE TO UP AND ATOM* https://www.youtube.com/c/upandatom A big th
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Dashes | Punctuation | Khan Academy

518 views / 0 likes - added 6 years ago

Dashes are like little actors—they can behave like colons, pairs of commas, or parentheses. Learn how to use them in this video! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/introduction-to-the-
05:10 Popular
Prepositions Of Space | Prepositions | The Parts Of Speech | Grammar

1,118 views / 0 likes - added 8 years ago

Some prepositions help describe relationships between objects and their locations in space. David explains how! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-preposition/e/prepositions-about-time-and-space Watch the nex
05:16 Popular
Prepositions Of Time | Prepositions | The Parts Of Speech | Grammar

1,319 views / 0 likes - added 8 years ago

Some prepositions help describe moments in time. Learn more and enhance your powers of time wizardry! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-preposition/e/prepositions-about-time-and-space Watch the next lesson:
07:57 Popular
Le Chatelier's principle: Worked example | Chemical equilibrium | Chemistry | Khan Academy

945 views / 0 likes - added 6 years ago

A worked example using Le Chatelier's principle to predict how concentrations will shift for different perturbations. Example includes changes in reaction vessel volume, changing amount of solid product, adding inert gas, and adding a catalyst. Chemistry
07:40 Popular
Can You Solve The 21 Flags Game From Survivor?

892 views / 1 likes - added 7 years ago

Contestants on the TV show "Survivor" faced off in a series of challenges for a grand prize of $1 million. Most of the challenges were physical like hiking many miles or diving underwater. But one challenge was mathematical. The game had 21 flags and cont
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BONUS: The Oxford comma | Punctuation | Grammar | Khan Academy

854 views / 0 likes - added 6 years ago

David and Paige tackle the great comma debate of our time: Oxford comma or no Oxford comma? Missed the previous lesson? https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/v/appositives-the-comma-punctuation-khan-academy?utm_source=YT&utm
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What is a sentence? | Syntax | Khan Academy

568 views / 0 likes - added 6 years ago

A sentence is a grammatically complete idea. All sentences have a noun or pronoun component called the subject, and a verb part called the predicate. David and Paige explore this division across several different example sentences. Watch the next lesson:
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28 AMAZING PHOTO HACKS TO TAKE PICTURES LIKE A PRO

464 views / 1 likes - added 4 years ago

FUN PHOTO HACKS YOU DIDNT KNOW YOU NEEDEDHello everyone! Today we have an amazing video for you thatll help you take next-level stunning photographs with your phone. Theres no need for a fancy camera, you only need to know these hacks and get creative wit
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BONUS: History of the apostrophe | The Apostrophe | Punctuation | Khan Academy

467 views / 0 likes - added 6 years ago

The apostrophe has a bizarre history, including being the name for something that's not really related to grammar at all. David, Paige, and special guest Jake explain. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/punctuation/the-a
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Using quotation marks in titles | Punctuation | Khan Academy

569 views / 0 likes - added 6 years ago

Learn how to use quotation marks to title things like poems, songs, and episodes of TV shows. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/italics--underlines--and-quotes/ Watch the next lesson:
01:32 Popular
Easy Puzzle - But can you solve it?

1,429 views / 0 likes - added 7 years ago

Solve this puzzle by cutting the piece of wood into two pieces. Both pieces must fit exactly into the hole. Can you solve this easy puzzle? Watch the video and find out. My name is Chris and my passion is to teach math. Learning should never be a struggle
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Conserving one of the oldest photographs in MoMA's collection | CONSERVATION STORIES

349 views / 0 likes - added 4 years ago

Tarnish is slowly engulfing one of the oldest objects in MoMA's collection, a daguerreotype from 1842 capturing two separate images—the Arch of Septimius Severus and Capitoline Lion in the Roman Forum. Within two years of the invention of photograph
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Three ways to end a sentence | Punctuation | Khan Academy

588 views / 0 likes - added 6 years ago

David and Paige, KA’s resident grammarians, introduce the three ways to end a sentence: the period, the exclamation point, and the question mark. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-comma/e/three-ways-to-end-a
03:29 Popular
Mind blowing brain teaser - Folding paper to the moon

922 views / 1 likes - added 7 years ago

Can you solve this mind blowing brain teaser? How many times can you fold a piece a paper before it reaches the moon? Find out the solution in this brain teaser in this video. My name is Chris and my passion is to teach math. Learning should never be a st
03:02 Popular
Can you solve the never ending square root?

3,007 views / 0 likes - added 7 years ago

This never ending square root can actually be solve using basic alegra. Find the exact value of this never square root. This problem is much easier than it looks. My name is Chris and my passion is to teach math. Learning should never be a struggle which
09:50 Popular
Can You Solve This 6th Grade Geometry Problem From China?

1,263 views / 1 likes - added 7 years ago

What is the total area of the red spots? The diagram involves a rectangle with dimensions of 10 and 20. Inside the rectangle one of its diagonals is connected. There are two circles of equal size that are tangent to each other and the rectangle. The video
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Introduction to Grammar | Grammar | Khan Academy

970 views / 0 likes - added 6 years ago

Khan Academy Grammarian David Rheinstrom welcomes you to his favorite topic: the study of language, its rules, and its conventions. By understanding English – by speaking it, by writing it, by reading this very sentence – you are a grammarian yourself! Wa
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Why does ice float? | SciShow Kids

94 views / 0 likes - added 12 months ago

Hosted by: Jessi Knudsen Castaeda (she/her/they/them)Kaitie Janecke Soltesz: WriterKyle Nackers: Fact CheckerJD Voyek: Script EditorMadison Lynn: VideographerStefan Chin: EditorAndrew Smith: Sound DesignerSavannah Geary: Associate ProducerDaniel Comiskey:
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Parentheses | Punctuation | Khan Academy

413 views / 0 likes - added 6 years ago

Parentheses set off extra information (such as a writer's remarks, an interruption, or a reference) from the rest of a sentence. Learn how to use them in this video! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneo
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If a tree falls in the forest and no one is there to hear it, does it make a sound?

682 views / 0 likes - added 5 years ago

Answering the age old philosophical question, if a tree falls in the forest and no one is there to hear it, does it make a sound? Check out the video we did over on Alie's channel! https://youtu.be/lf1wPcF-fXw Subscribe to NeuroTransmissions! https://www.
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17 FAST MATHS TRICKS YOU MUST KNOW

470 views / 0 likes - added 6 years ago

Wanna be a Math genius? Check out these tricks! They're garanteed to upgrade your Math skills and bring you on another level! ;) Subscribe to 5-Minute Crafts GIRLY: https://goo.gl/fWbJqz Subscribe to 5-Minute Workouts: https://goo.gl/67owiQ 5-Minute Craft
02:06 Popular
Can You Solve The Viral Matchstick Puzzle 6 + 4 = 4?

3,485 views / 0 likes - added 7 years ago

Can you fix 6 + 4 = 4 by moving 1 matchstick? This problem has gone viral on Facebook, with one post having over 400,000 shares. The ground rules are you cannot break a stick, it should be an equality (=), and you have to use 7-segment numbers (the block
00:57 Popular
How Do You Multiply Numbers in Brackets?

1,272 views / 0 likes - added 5 years ago

How Do You Multiply Numbers in Brackets?. Part of the series: Math Help With Multiplying. Multiplying numbers in brackets requires a very specific procedure. Multiply numbers in brackets with help from a mathematics educator in this free video clip. Read
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Top 10 Puzzles Only The Smartest 2% Can Solve

1,596 views / 1 likes - added 5 years ago

These amazing top 10 puzzles are the best way to challenge and grow your mind to become smarter than you are. There are also few riddles and some tricky brain teasers which only 2% of the people were able to solve. So, it's a great chance to see if you ar
02:20 Popular
How to Solve Sine & Cosine Equations

1,707 views / 0 likes - added 5 years ago

How to Solve Sine & Cosine Equations. Part of the series: Equations. Sine and cosine equations need to be solved in a very specific way. Learn how to solve sine and cosine equations with help from an experienced math tutor in this free video clip. Read mo
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A Miraculous Proof (Ptolemy's Theorem) - Numberphile

300 views / 0 likes - added 3 years ago

Featuring Zvezdelina Stankova... Want more? Part 2 (bringing in Pentagons and the Golden Ratio) is at: https://youtu.be/o3QBgkQi_HAMore links & stuff in full description below Zvezda's Numberphile playlist: http://bit.ly/zvezda_videosZvezda's webpage: htt
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Can Machines Be Conscious?

510 views / 0 likes - added 6 years ago

Can machines be conscious? What is exactly is consciousness? In this video, we'll take dive into the possibilities of artificial consciousness and what it means for the future of AI and humanity. Hi! I'm Jade. Subscribe to Up and Atom for new physics, mat
03:45
Introduction to the possessive | The Apostrophe | Punctuation | Khan Academy

608 views / 0 likes - added 6 years ago

Apostrophes can help show when something belongs to someone. Paige and David explain how! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-apostrophe/e/introduction-to-the-possessive-case Watch the next lesson: https://www
12:19
Lattice Multiplication

474 views / 0 likes - added 3 years ago

This math video tutorial provides a basic introduction into lattice multiplication - another way of multiplying two numbers! Subscribe: https://www.youtube.com/channel/UCEWpbFLzoYGPfuWUMFPSaoA?sub_confirmation=1 Access to Premium Videos: https://www.patre
05:07 Popular
Complex sentences | Syntax | Khan Academy

781 views / 0 likes - added 6 years ago

Complex sentences are simple sentences with dependent or subordinate clauses added to them. Paige and Rosie explain how to spot them and use them in this video. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/syntax/v/compound-comple
03:50
Adjectives and commas | Adjectives | Khan Academy

700 views / 1 likes - added 6 years ago

When using more than one adjective, sometimes you put a comma between them and sometimes you don't. Learn how to tell when you need a comma in this video! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-modifier/e/commas-
01:27 Popular
The Easiest Brain Teaser that will rack your brain

926 views / 0 likes - added 7 years ago

This is the easiest brain teaser that will rack your brain. 5 people can build 5 houses in 5 days. How long will it take 100 people to build 100 houses? My name is Chris and my passion is to teach math. Learning should never be a struggle which is why I m
04:55 Popular
Solve the right triangle - Trigonometry Brain Teaser

1,697 views / 0 likes - added 7 years ago

A square is inside of a right triangle. The length of each side of the triangle is 3-4-5. Given this information what are the dimensions of the square? Can you solve this right triangle? My name is Chris and my passion is to teach math. Learning should ne
03:04 Popular
Trick Question - Find the missing dollar

759 views / 1 likes - added 7 years ago

Trick question! Three friends are overcharged for their hotel room. The hotel decides to refund the difference. After the hotel issues the refund one dollar has mysteriously disappeared. Where is the missing dollar? Find the solution to this trick questio
03:33 Popular
Land And Water: Crash Course Kids #16.1

1,240 views / 2 likes - added 8 years ago

Remember Sol, the closest star to Earth? We like to call it The Sun and we haven't talked about it in a little while. One interesting thing about the energy we get from the sun is that it's not absorbed the same way by different materials. In fact, even a
01:36 Popular
Are you smart enough to solve this simple brain teaser?

776 views / 0 likes - added 7 years ago

This simple brain teaser is not so easy. A virus is doubling every singe day. On the 67th day the virus has reached its max population. When will the virus reach half of its max population. My name is Chris and my passion is to teach math. Learning should
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Advanced (plural) possession | The Apostrophe | Punctuation | Khan Academy

566 views / 0 likes - added 6 years ago

Paige and David talk about using apostrophes to show that something belongs to multiple people. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-apostrophe/e/advanved--plural--possesion Watch
01:07 Popular
The Easiest Brain Teaser You Might Get Wrong

945 views / 4 likes - added 7 years ago

Try and solve the easiest brain teaser you might get wrong. The chicken costs $1.00 more than the egg, and together they cost a total of $1.06. How much does the egg cost? My name is Chris and my passion is to teach math. Learning should never be a strugg
01:51
Possession for words ending in “s” | The Apostrophe | Punctuation | Khan Academy

512 views / 0 likes - added 6 years ago

Do words that end in "s" still need _'s_ to show possession? David and Paige explain! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-apostrophe/e/introduction-to-the-possessive-case Watch the next lesson: https://www.kha
3:04:00 Popular
Disney RELAXING PIANO Collection -Sleep Music, Study Music, Calm Music (Piano Covered by kno)

2,336 views / 17 likes - added 2 years ago

#Disney #Disneypiano #knopianomusic 00:00 Someday My Prince Will Come (From "Snow White and the Seven Dwarfs") 02:18 A Dream is a Wish Your Heart Makes (From "Cinderella") 05:23 The Second Star to the Right (From "Peter Pan") 08:58 Part of Your World From
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Choosing between its and it’s | The Apostrophe | Punctuation | Khan Academy

533 views / 1 likes - added 6 years ago

David and Paige explain the meaning of two English words that look and sound very similar but act very different: _its_ and _it's_. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-apostrophe
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How To Calculate The Sales Price After Discount

284 views / 0 likes - added 3 years ago

This math video tutorial explains how to calculate the sales price after a discount is applied.My Website: https://www.video-tutor.netPatreon: https://www.patreon.com/MathScienceTutorAmazon Store: https://www.amazon.com/shop/theorganicchemistrytutor
03:36 Popular
Introduction to contractions | The Apostrophe | Punctuation | Khan Academy

942 views / 1 likes - added 6 years ago

Apostrophes are great at standing in for missing letters, allowing us to shorten words. Paige and David discuss contractions and the Principle of Least Effort. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-apostrophe/e/
06:18 Popular
Can You Solve The Diluted Wine Puzzle?

766 views / 1 likes - added 7 years ago

A servant has a method to steal wine. He removes 3 cups from a barrel of wine and replaces it with 3 cups of water. The next day he wants more wine, so he does the same thing: he removes 3 cups from the same barrel (now with diluted wine) and replaces it
07:25 Popular
Algebra Word Problem - Factoring

1,708 views / 0 likes - added 7 years ago

Learn how to solve this algebra word problem by factoring. A garden has an area of 84 square feet and the length is 8 feet longer than the width. You must find the dimensions of the garden using factoring. My name is Chris and my passion is to teach math.
01:34 Popular
What Happens When a Fraction Is Multiplied by Its Reciprocal?

866 views / 0 likes - added 5 years ago

What Happens When a Fraction Is Multiplied by Its Reciprocal?. Part of the series: Math Help With Multiplying. When a fraction is multiplied by its reciprocal a very specific thing occurs. Learn what happens when a fraction is multiplied by its reciprocal
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21-card trick - Numberphile

986 views / 0 likes - added 5 years ago

A simple trick with some neat math behind it. More on Numberphile cards at: http://www.bradyharanblog.com/numberphile-playing-cards More links & stuff in full description below ↓↓↓ More cards video: http://bit.ly/Cards_Shuffling This vi
03:19 Popular
Commas in space and time | The Comma | Punctuation | Khan Academy

827 views / 0 likes - added 6 years ago

Learn how to use commas when writing addresses (in space) and dates (in time). Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/salutations--valedictions--dates--and-addresses Watch t
08:38
The Worlds Blackest Black vs The Worlds Brightest Flashlight (32,000 lumen)—Which Will Win?

590 views / 1 likes - added 6 years ago

Help Me Make Videos Here: https://www.patreon.com/user?u=4933784 Where I got my flashlight: Outdooor Searching LED Flashlight 806M: https://goo.gl/TMdifY 18650 Flashlights: https://goo.gl/JVeZXw Banggood: https://goo.gl/jnSjsG Flash Deals: https://goo.gl/
04:09 Popular
Easy algebra word problem - But can you solve it?

1,446 views / 0 likes - added 7 years ago

Two workers can build a house in 4 days. One worker can build the house by himself in 6 days. How long would it take the other worker to build the house by himself? Can you solve this easy algebra word problem? My name is Chris and my passion is to teach
07:04 Popular
Dependent and independent clauses | Syntax | Khan Academy

1,285 views / 0 likes - added 6 years ago

Independent clauses can stand on their own as sentences, but dependent clauses can’t. We’ll take a closer look at what this means. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/dependent-and-independent-clauses Wat
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Subject-verb agreement | Syntax | Khan Academy

633 views / 0 likes - added 6 years ago

Agreement is the art of making sure that sentence parts agree with one another; you want to make sure that your subjects and verbs match up. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/subject-verb-agreement Watc
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Why Is the Ocean Blue?

640 views / 1 likes - added 6 years ago

You may have satisfied your inner five-year-old by learning why the sky is blue, but where does the ocean's color come from? Hosted by: Olivia Gordon ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Do
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03:05 Popular
Four Steps to Solve a Absolute Value Equation

1,061 views / 0 likes - added 5 years ago

Four Steps to Solve a Absolute Value Equation. Part of the series: Help With Equations. Solving a absolute value equation requires you to complete four distinct steps. Learn the four steps to solve an absolute value equation with help from an experienced
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HUMAN CALCULATOR vs CALCULATOR #shorts

242 views / 0 likes - added 1 year ago

WHAT???? Watch "10 People vs Human Calculator!" https://youtu.be/-KttdsAnNRkSubscribe to Michelle: https://www.youtube.com/channel/UCc-WbFxYCQUdFkgEuJF19zwWatch "I Solved The World's Longest Math Problem!" https://youtu.be/ggH4EfCC-r0Business Inquiries: i
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Pendulum Snake | Build Your Own Exploratorium

510 views / 0 likes - added 3 years ago

The Pendulum Snake exhibit blends art and science into a mesmerizing visual display of physics and timea swinging series of pendulums that reveals a remarkable pattern found in nature. Join Senior Scientist Julie Yu in exploring the math behind this beaut
05:38 Popular
Algebra word problem - System of Equations

1,927 views / 0 likes - added 7 years ago

Solve this fun algebra word problem using a system of equations. If each jar has three cookies, one jar will be empty. If each jar has two cookies, there will be one cookie left over. Use a system of equations to find how many cookies and jars we have. My
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Exclamations | Syntax | Khan Academy

480 views / 0 likes - added 6 years ago

An exclamation is a sentence that expresses great emotion! David and Paige covered declarative, interrogative, and imperative sentences; now they tackle a fourth type of sentence that ends in an exclamation mark. Find out more! Watch the next lesson: http
02:09 Popular $What is a fractal? A lens to infinity$
What is a fractal? A lens to infinity

1,246 views / 1 likes - added 5 years ago

A fractal pattern is a kind of equation occurring all around us in nature. So what's a fractal and what does it have to do with nautiluses, romanesco broccoli, Star Trek II: The Wrath of Khan, peacocks, and predicting diseases? SUBSCRIBE! for more Popular
04:14 Popular
Compound-complex sentences | Syntax | Khan Academy

852 views / 0 likes - added 6 years ago

Compound-complex sentences are compound sentences with dependent or subordinate clauses added to them. Paige and Rosie explain how to spot and use them. Practice this yourself on Khan Academy right now www.khanacademy.org/syntax/e/complex-and-compound-com
03:59 Popular
How to Easily Memorize the Multiplication Table I The Great Courses

1,014 views / 0 likes - added 7 years ago

Most of us, when faced with math problems like these, immediately reach for a calculator or a pen. But imagine if you could perform these and other seemingly difficult—but surprisingly easy—calculations right in your head. Seems like an imposs
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02:51
Apostrophes and plurals | The Apostrophe | Punctuation | Khan Academy

469 views / 0 likes - added 6 years ago

There is *one* extremely rare case in which we use apostrophes to make things plural. David and Paige, KA's resident grammarians, discuss this unusual case. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/p
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How to Multiply Negative Mixed Numerals

1,306 views / 0 likes - added 5 years ago

How to Multiply Negative Mixed Numerals. Part of the series: Math Help With Multiplying. Multiplying negative mixed numerals quires you to keep a few very important things in mind. Find out how to multiply negative mixed numerals with help from a mathemat
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Three types of sentence | Syntax | Khan Academy

644 views / 0 likes - added 6 years ago

Three essential types of sentence are declarative sentences (which are statements), interrogative sentences (which are questions), and imperative sentences (which are orders). Join us as we give examples of each! Practice this yourself on Khan Academy rig
02:15 Popular
How to Add Square Roots to Numerator Fractions

1,006 views / 1 likes - added 5 years ago

How to Add Square Roots to Numerator Fractions. Part of the series: Math Problems. Adding square root numerator fractions requires you to keep the terms in the problem separate. Add square root numerator fractions with help from a mathematics educator in
01:34
Dividing / Division Of Integers

671 views / 0 likes - added 8 years ago

Dividing / Division of Integers. In this example, I do some basic examples of dividing integers. For more free math videos, visithttp://JustMathTutoring.com
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Parallel structure | Syntax | Khan Academy

660 views / 0 likes - added 6 years ago

Parallel structure isn’t a set rule, but more of a stylistic choice: it helps sentence elements maintain a pattern. This is a very special episode because it’s Paige’s last video with us as a KA intern! We will miss having Paige as a contributor to the Gr
05:04
The Coin Hexagon - Numberphile

386 views / 0 likes - added 6 years ago

Featuring Alex Bellos. See the accompanying Dudeney Pentominoes video: https://youtu.be/wZ1E_CM7MqA More links & stuff in full description below ↓↓↓ More Alex Bellos videos: http://bit.ly/Bellos_Playlist Coin playlist: http://bit.ly/coins_videos Box of Pu
02:01 Popular
The present tense | The parts of speech | Grammar | Khan Academy

810 views / 0 likes - added 6 years ago

How do we talk about things that are happening right now? Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/the-past-tense-verbs-the-parts-of-speech?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Misse
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BONUS VIDEO | Singular They | The parts of speech | Grammar | Khan Academy

519 views / 0 likes - added 6 years ago

You may have been hearing a lot about the "singular they" recently. But what is it? How does it work, what is its history, and is it grammatical? Let's find out. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-modif
02:00 Popular
The past tense | The parts of speech | Grammar | Khan Academy

930 views / 0 likes - added 6 years ago

When you want to talk about events that have already happened, you use the past tense. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/the-future-tense-verbs-the-parts-of-speech?utm_source=YT&utm_medium=
02:50 Popular
The future tense | The parts of speech | Grammar | Khan Academy

966 views / 0 likes - added 6 years ago

When you want to talk about the future in English, you use the future tense. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/linking-verbs-the-parts-of-speech-grammar?utm_source=YT&utm_medium=Desc&utm_ca
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Dangling modifiers | Syntax | Khan Academy

597 views / 0 likes - added 6 years ago

A modifying word or phrase “dangles” when it doesn’t apply to the word it’s supposed to modify. Learn how to spot and fix this problem! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/dangling-modifiers/ Watch the ne
11:57
The Wallis Formula For π

586 views / 0 likes - added 7 years ago

Start with the pair of fractions (2/1)(2/3). Now increment each number by 2 to get the pair of fractions (4/3)(4/5). Repeat this to get the next pair, and repeat this infinitely many times. If you then multiply all the fractions, you get a marvelous value
04:29 Popular
Simple and compound sentences | Syntax | Khan Academy

928 views / 0 likes - added 6 years ago

A simple sentence contains one independent clause. A compound sentence contains more than one! Put another way: a simple sentence contains a subject and a predicate, but a compound sentence contains more than one subject and more than one predicate. Pract
02:18 Popular
Salutations and valedictions | Punctuation | Grammar | Khan Academy

831 views / 0 likes - added 6 years ago

David and Paige, KA’s resident grammarians, talk about how to address and sign off on letters using commas! Watch the next lesson: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/v/commas-in-space-and-time-the-comma-punctuation-khan-a
02:08 Popular
Tutorial for Adding & Subtracting Fractions

2,034 views / 0 likes - added 5 years ago

Tutorial for Adding & Subtracting Fractions. Part of the series: Adding and Subtracting Fractions. Adding and subtracting fractions is a lot like riding a bike - once you know how, you never forget. Get a tutorial for adding and subtracting fractions with
04:07 Popular
Pronoun-antecedent agreement | Syntax | Khan Academy

782 views / 0 likes - added 6 years ago

An antecedent is “the thing that came before”. When you use a pronoun, it’s standing in for a word you used previously—that’s the antecedent. Join us as we demonstrate how to make sure that your pronouns and antecedents match up with one another: that’s c
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Recognizing fragments | Syntax | Khan Academy

496 views / 0 likes - added 6 years ago

A sentence fragment is a chunk of language that hasn’t made it all the way to being a working sentence; it might be missing a verb, or there might not be a subject. Learn how to turn a fragment into a sentence in this video! Practice this yourself on Khan
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Run-ons and comma splices | Syntax | Khan Academy

606 views / 0 likes - added 6 years ago

A run-on sentence doesn’t separate any of its independent clauses with the punctuation that it needs, and a comma splice incorrectly separates two independent clauses with a comma, instead of a comma-and-coordinating-conjunction. Practice this yourself on
01:56 Popular
Relative pronouns | The parts of speech | Grammar | Khan Academy

1,132 views / 0 likes - added 6 years ago

We use the relative pronouns to connect clauses together, like "the man *who sold the world* is coming over for dinner." David, KA's Grammar Fellow, explains. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/
03:50 Popular
Can You Solve The Bridge Riddle? - Alex Gendler

2,071 views / 3 likes - added 8 years ago

View full lesson: https://ed.ted.com/lessons/can-you-solve-the-bridge-riddle-alex-gendler Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol just to see what it did probably wasn’t s
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Subjects and predicates | Syntax | Khan Academy

666 views / 0 likes - added 6 years ago

A subject is the noun or pronoun-based part of a sentence, and a predicate is the verb-based part that the subject performs. Let’s explore how that works in context. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/id
05:27 Popular
Can You Solve The Mind-Bending Self-Counting Sentence Riddle?

960 views / 0 likes - added 7 years ago

"In this sentence, the number of occurrences of the digit 0 is __, of the digit 1 is __, of the digit 2 is __, of the digit 3 is __, of the digit 4 is __, of the digit 5 is __, of the digit 6 is __, of the digit 7 is __, of the digit 8 is __, and of the d
02:08 Popular
Amazing T-Rex Illusion!

1,165 views / 3 likes - added 8 years ago

Add me on Facebook (click LIKE on Facebook to add me) http://www.facebook.com/brusspup I created the song in this video. You can download it on iTunes or Google Play. Song name: The last sun. https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewAlbum?id
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28 SIMPLE STUDY TRICKS THAT WILL COMPLETELY CHANGE YOUR LIFE

572 views / 0 likes - added 5 years ago

FANTASTIC STUDY HACKS AND IDEAS School can be real fun, especially if you just learn a couple of our awesome ideas and life hacks. I promise, our amazing school crafts can help to make your studies even brighter and smarter. You'll learn how to cope with
16:36 Popular
Writing: Informative — How-to Example | Reading & Writing | New SAT | Khan Academy

923 views / 0 likes - added 8 years ago

Watch Sal work through an SAT Writing: Informative passage. Watch the next lesson: https://www.khanacademy.org/test-prep/new-sat/new-sat-reading-writing/new-sat-writing-passages/v/sat-writing-narrative?utm_source=YT&utm_medium=Desc&utm_campaign=NewSAT Mis
03:24 Popular
More uses for commas | Punctuation | Grammar | Khan Academy

807 views / 0 likes - added 6 years ago

David and Paige, KA’s resident grammarians, discuss tag questions, yes and no statements, and direct address -- all situations where the comma is super useful. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/v/c
03:02 Popular
Linking verbs | The parts of speech | Grammar | Khan Academy

1,661 views / 0 likes - added 6 years ago

In a previous video, we established that one thing verbs can do is show actions, like "the bear runs." Verbs can also link ideas to one another, like "the bear looks cheerful." Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofs
21:02 Popular
Writing: Argument — How-to Example | Reading & Writing | New SAT | Khan Academy

776 views / 0 likes - added 8 years ago

Watch Sal work through an SAT Writing: Argument passage. Watch the next lesson: https://www.khanacademy.org/test-prep/new-sat/new-sat-reading-writing/new-sat-writing-passages/v/sat-writing-informational-passage?utm_source=YT&utm_medium=Desc&utm_campaign=N
01:46 Popular
Multiplication / Multiplying Integers

1,977 views / 0 likes - added 8 years ago

Multiplication / Multiplying Integers. Here I look at a couple of quick examples dealing with multiplication of integers. The only things we have be really careful of is the sign we get after multiplying. Otherwise, it is the same as multiplying all posit
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Build the Best Solar Oven Ever! | Engineering Project

381 views / 0 likes - added 3 years ago

Mister Brown and Squeaks decide to design a solar oven, so they can cook their lunch while they play outside!----------Love SciShow Kids and want to help support it? Become a Patron on Patreon: https://www.patreon.com/scishowIf you have a question for Jes
04:44 Popular
Relative clauses | Syntax | Khan Academy

753 views / 0 likes - added 6 years ago

A relative pronoun is a word like “that” or “which” or “who”, so a relative clause is a clause that begins with a relative pronoun. In the sentence “The dragon who breathed blue fire has retired,” “who breathed blue fire” is a relative clause. Learn more
03:37 Popular
The Time Value Of Money - German Nande

935 views / 1 likes - added 9 years ago

View full lesson: http://ed.ted.com/lessons/how-to-calculate-the-future-value-of-your-cash-german-nande We've all heard the phrase "Time is money." But what do these two things actually have to do with one another? German Nande explains the math behind in
05:41 Popular
That versus which | The parts of speech | Grammar | Khan Academy

970 views / 0 likes - added 6 years ago

Much has been made of the distinction between "that" and "which" in English, but it can mostly be summed up in two points: 1. "That" doesn't work so well with commas. 2. "Which" doesn't work so well with people. David the Grammarian explains. Watch the ne
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The Easiest Problem Everyone Gets Wrong

1,576 views / 0 likes - added 3 years ago

Watch my newest video, "Could a Toothpaste Sandwich Brush Your Teeth?": https://youtu.be/OdeiWhETqQYWe know how difficult the Monty Hall Problem is for so many people even after theyre shown all the math behind the best possible strategy. Its basic probab
05:57 Popular
Phrases and clauses | Syntax | Khan Academy

1,527 views / 0 likes - added 6 years ago

A phrase is any collection of words that behaves like a part of speech, like a noun phrase (“my brother Stu”), an adjectival phrase (“in a different shade of blue”), or an adverbial phrase (“with elegance and tact”). A clause is any noun phrase plus a ver
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Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy

1,153 views / 0 likes - added 6 years ago

Introduction to bond enthalpy, and how to use bond enthalpies to calculate enthalpy of reaction. Watch the next lesson: https://www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/2015-ap-chemistry-free-response-7?utm_s
02:23 Popular
Tricks to Learn When Multiplying and Dividing Fractions With Mixed Numbers

1,777 views / 0 likes - added 5 years ago

Tricks to Learn When Multiplying and Dividing Fractions With Mixed Numbers. Part of the series: Math Help With Multiplying. When it comes to learning multiplying and dividing, a few tricks can make things easier. Learn about tricks to getting the hang of
06:13 Popular
Rate constant k from half-life example | Knetics | Chemistry | Khan Academy

932 views / 0 likes - added 6 years ago

Example problem showing how to find the rate constant k from the half-life of a first order reaction. Watch the next lesson: https://www.khanacademy.org/science/chemistry/chem-kinetics/copy-of-kinetics/v/second-order-reaction-with-calculus?utm_source=YT&u
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Introduction to verbs | The parts of speech | Grammar | Khan Academy

618 views / 0 likes - added 6 years ago

Let's explore what verbs are, and what they do! David, KA's Grammar Fellow, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/e/identifying-verbs?utm_source=YT&utm_medium
04:33 Popular
Coordinating conjunctions | The parts of speech | Grammar | Khan Academy

997 views / 0 likes - added 6 years ago

Coordinating conjunctions connect parts of sentences to each other. David explains how. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/e/meet-the-conjunction?utm_source=YT&utm_me
07:14 Popular
Calculating internal energy and work example | Chemistry | Khan Academy

1,096 views / 0 likes - added 6 years ago

Worked example calculating the change in internal energy for a gas using the first law of thermodynamics. Watch the next lesson: https://www.khanacademy.org/science/chemistry/thermodynamics-chemistry/internal-energy-sal/v/specific-heat-and-latent-leat-of-
07:50 Popular
pH and pKa relationship for buffers | Chemistry | Khan Academy

834 views / 0 likes - added 6 years ago

How the Henderson-Hasselbalch equation can be used to look at the ratio of conjugate acid and base using relationship between buffer pH and pKa. Watch the next lesson: https://www.khanacademy.org/science/chemistry/acid-base-equilibrium/buffer-solutions/v/
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Pythagoras Would Be Proud: High School Students' New Proof of the Pythagorean Theorem [TRIGONOMETRY]

179 views / 0 likes - added 1 year ago

Calcea Johnson and Ne’Kiya Jackson are two high school students at St. Mary's Academy in New Orleans who recently presented a new proof of the Pythagorean theorem at the Spring Southeastern Sectional Meeting of the American Mathematical Society. The
03:59 Popular
Meet the Comma | Punctuation | Grammar | Khan Academy

912 views / 1 likes - added 6 years ago

David and Paige introduce you to the superhero of the punctuation world: the comma! Practice this yourself on Khan Academy right now: . Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/
03:00 Popular
Commas in dialogue | Punctuation | Grammar | Khan Academy

1,171 views / 1 likes - added 6 years ago

“Today we’re going to talk about using commas in dialogue,” said David and Paige, KA’s resident grammarians. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/commas-in-dialogue?utm_so
04:47
Who versus whom | The parts of speech | Grammar | Khan Academy

599 views / 0 likes - added 6 years ago

When do you use who, and when do you use whom? David, KA's grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/e/relative-pronouns?utm_source=YT&utm_medium=Desc&u
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Appositives | Punctuation | Grammar | Khan Academy

634 views / 0 likes - added 6 years ago

David and Paige, KA’s resident grammarians, cover appositives and how to use commas along with them. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/appositives?utm_source=YT&utm_med
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Personal pronouns | The parts of speech | Grammar | Khan Academy

654 views / 0 likes - added 6 years ago

Let's meet the personal pronouns! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/e/meet-the-personal-pronoun?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Watch the next less
03:12 Popular
Correlative conjunctions | The parts of speech | Grammar | Khan Academy

1,015 views / 0 likes - added 6 years ago

Correlative conjunctions work in pairs to connect parts of sentences. David teaches you how they do it! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/e/correlative-conjuntions?u
05:27 Popular
Subordinating conjunctions | The parts of speech | Grammar | Khan Academy

1,251 views / 0 likes - added 6 years ago

Subordinating conjunctions join two parts of complex sentences––independent clauses to dependent clauses. David explains how. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/e/coo
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Punctuating a list | Punctuation | Grammar | Khan Academy

585 views / 0 likes - added 6 years ago

Learn how to use commas to punctuate a written list of people, things, actions, or events. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/punctuating-lists?utm_source=YT&utm_medium=

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