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• 13:17

### Probability that at least 2 people in a room of 30 share the same birthday | Probability and Statist

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The probability that at least 2 people in a room of 30 share the same birthday. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/probability/probability-and-combinatorics-topic/probability_combinatorics/e/probab

• 07:18

### Diagramming how a bill becomes a law in the U.S.

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Diagramming how a bill becomes a law.

• 05:42

### Examples of null and alternative hypotheses

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Examples of null and alternative hypotheses

• 07:58

### p values and significance tests

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p values, significance levels, null hypotheses, alternative hypotheses, and significance tests

• 04:45

### Estimating p value from simulation

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Example estimating a p-value based on a simulation to approximate the sample distribution of the sample proportions (assuming the null hypothesis is true).

• 04:51

### Ratios for recipes

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Ratios and fractions for cooking recipes.

• 08:26

### Conjugate acid-base pairs | Acids and bases | Chemistry | Khan Academy

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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

• 07:57

### Le Chatelier's principle: Worked example | Chemical equilibrium | Chemistry | Khan Academy

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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

• 07:37

### Introduction to reaction quotient Qc | Chemical equilibrium | Chemistry | Khan Academy

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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

• 11:47

### Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy

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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

• 07:32

### Ionic bonds and Coulombs law

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Introduction to how the strength of ionic bonds is related to Coulomb's law. Example of using Coulomb's law to explain differences in melting points of ionic compounds.

• 07:14

### Calculating internal energy and work example | Chemistry | Khan Academy

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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-

• 05:53

### Comparing Q vs K example | Chemical equilibrium | Chemistry | Khan Academy

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A worked example using reaction quotient Q to predict how concentrations will shift so the reaction can get to equilibrium. Watch the next lesson: https://www.khanacademy.org/science/chemistry/acids-and-bases-topic/acids-and-bases/v/arrhenius-definition-o

• 07:33

### Ways to get a buffer solution | Chemistry | Khan Academy

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Describes the two main situations where you get a buffer: making a buffer for a specific pH by combining a weak acid and a salt containing the conjugate base, and using a neutralization reaction by combining a weak acid and a strong base. Watch the next l

• 06:13

### Rate constant k from half-life example | Knetics | Chemistry | Khan Academy

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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

• 06:19

### AP Chemistry multiple choice sample: Boiling points

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Comparing the boiling point of nonane and 2,3,4-trifluoropentane. A sample multiple choice problem from the 2014 AP course description.

• 06:52

### 2015 AP chemistry free response 5a

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Finding the order of reaction for kinetics of bleaching food coloring. An alternative method of solving 2015 AP Chemistry free response 5a.

• 07:50

### pH and pKa relationship for buffers | Chemistry | Khan Academy

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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/

• 06:47

### Noble gas configuration

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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

• 07:45

### Introduction to chemistry

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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

• 10:33

### The Middle colonies

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The Middle colonies consisted of Pennsylvania, New Jersey, New York, and Delaware. Located in the middle of the Atlantic seaboard, their economies combined the industry of the North with the agriculture of the South. They were unusual, however, for their

• 11:07

### Society and religion in the New England colonies

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The New England colonies organized society around the Puritan religion and family farming. In this video, Kim explores New England settlers' reasons for immigrating to North America and their farming and fishing economy.

• 11:46

### Politics and native relations in the New England colonies

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Although the New England colonies differed from the Chesapeake colonies in their economies and environments, both regions shared forms of government that were unusually democratic for the time period, as well as a policy of excluding Native Americans from

• 11:57

### The West Indies and the Southern colonies

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Plantation agriculture, and slave labor, united the British colonies in the West Indies and the southern part of the eastern seaboard. In this video, Kim discusses the sugar islands of the Caribbean and how their reliance on enslaved Africans for labor de

• 11:27

### The History of the Republican Party

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Heading into the 2016 Republican National Convention, we thought it would be a good time to do a quick history of the GOP, from its origins before the Civil War through the elections of Lincoln, Eisenhower and Reagan. And where does that elephant symbol c

• 02:48

### United Kingdom vs Great Britain vs England primer

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A primer on the United Kingom vs Great Britain vs England.

• 15:54

### The History of the Democratic Party

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This week, as America's attention is focused on the Democratic National Convention in Philadelphia, we bring you a quick overview of the history of the Democratic Party. 200+ years was hard to fit into 16 minutes, but we got most of the highlights, from J

• 38:29

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Need help with SAT reading? Join Eric, one of Khan Academy’s SAT experts, for an SAT reading class. During class, Eric explains a proactive approach to answering reading questions and walks through some of the most common types of questions. This is an ed

• 1:02:11

### Khan Academy Live: SAT Writing Class

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Need help with SAT writing? Join Eric, one of Khan Academy’s SAT experts, for an SAT writing class. Eric walks through key grammar concepts like subject-verb agreement and sentence punctuation. This is an edited version of our livestream from March 9, 201

• 1:10:07

### Khan Academy Live: AP Calculus

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Taking AP Calculus? Prep for the exam with our free live tutoring session. Dave, one of our calculus experts, will review key concepts, solve sample questions, and share ways to avoid common mistakes. Prep for your AP Calculus exams on Khan Academy: https

• 1:02:43

### Khan Academy Live: AP US History

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Taking AP US History? Prep for the AP exam with our free live tutoring session. Kim, our history expert, will share tips and strategies for the exam. Study for AP US History on Khan Academy: https://www.khanacademy.org/humanities/us-history/ap-us-history

• 48:26

### Khan Academy Live: SAT Math

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Need help with SAT math? Join Eric, one of Khan Academy’s SAT experts, for an SAT math class. Eric reviews some of the most important math skills for the test and provides tips on how to avoid careless mistakes. This is a recording of our May 16 livestrea

• 51:15

### Khan Academy Live: SAT Writing

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Need help with SAT writing? Join Eric, one of Khan Academy’s SAT experts, for a live SAT writing class Tuesday, May 30 at 7 pm ET/4pm PT. It’s free! Eric will walk through key grammar concepts like subject-verb agreement and sentence punctuation. Can’t ma

• 04:18

### Affect and effect | Frequently confused words | Usage | Grammar

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TL;DW: affect's a verb and effect's a noun. But there's a little more to it than that.

• 06:21

### Alliteration, Assonance, and Onomatopoeia | Style | Grammar

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This video will teach you all about the different ways you can use the sound of words for effect. Alliteration is when you use a bunch of similar consonants in a row; assonance is when you use a bunch of similar vowel sounds in a row; onomatopoeia is basi

• 04:15

### Compliment/complement and desert/dessert | Frequently confused words | Usage | Grammar

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• 03:14

### Hear/here and accept/except | Frequently confused words | Usage | Grammar

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• 07:12

### Less versus fewer | Frequently confused words | Usage | Grammar

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How do you know when to use "less" or "fewer" when describing the quantity or amount of things?

• 03:21

### There, their, and they're | Frequently confused words | Usage | Grammar

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This is one of the most frequently-confused trios in the English language. Follow along, and learn to suss out the differences between these three words.

• 05:43

### Under- and overstatement | Style | Grammar

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This is, bar none, the greatest video Khan Academy has ever made, although I may be slightly overstating that. Learn how to master this style by following along.

• 06:11

### Bare/bear, allowed/aloud, advice/advise, break/brake | Frequently confused words | Usage | Grammar

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Learn to tell the differences between these eight frequently-confused words!

• 07:58

### Irony | Style | Grammar

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Irony, puns, and sarcasm are some of the toughest concepts in English. This video attempts to explain all three.

• 08:14 Popular

### The scale of formality | Style | Grammar

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How formal or informal should you be when you write or speak? Let's dive into that!

• 03:19

### To, two, and too | Frequently confused words | Usage | Grammar

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Another troublesome triad, "to", "two", and "too". Let's set these frequently-confused words straight!

• 05:05

### Parallel structure | Syntax | Khan Academy

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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

• 04:44

### Relative clauses | Syntax | Khan Academy

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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

• 07:04

### Dependent and independent clauses | Syntax | Khan Academy

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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

• 05:57

### Phrases and clauses | Syntax | Khan Academy

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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

• 04:19

### Dangling modifiers | Syntax | Khan Academy

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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

• 04:43

### Subject, direct object, and indirect object | Syntax | Khan Academy

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A subject is the noun phrase that drives the action of a sentence; in the sentence “Jake ate cereal,” Jake is the subject. The direct object is the thing that the subject acts upon, so in that last sentence, “cereal” is the direct object; it’s the thing J

• 02:34

### Subjects and predicates | Syntax | Khan Academy

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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

• 04:38

### Run-ons and comma splices | Syntax | Khan Academy

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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

• 03:48

### Recognizing fragments | Syntax | Khan Academy

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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

• 04:07

### Pronoun-antecedent agreement | Syntax | Khan Academy

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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

• 04:53

### Subject-verb agreement | Syntax | Khan Academy

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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

• 04:14

### Compound-complex sentences | Syntax | Khan Academy

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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

• 05:07

### Complex sentences | Syntax | Khan Academy

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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

• 04:29

### Simple and compound sentences | Syntax | Khan Academy

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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

• 02:50

### Exclamations | Syntax | Khan Academy

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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

• 03:32

### Three types of sentence | Syntax | Khan Academy

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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

• 04:34

### What is a sentence? | Syntax | Khan Academy

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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:

• 02:54

### BONUS: "FANBOYS," a mnemonic song | Conjunctions | Parts of speech| Khan Academy

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FANBOYS" is a mnemonic device you can use to help remember the coordinating conjunctions of English. Team Grammar made this video, figuring that we couldn't very well cover conjunctions without writing a song, now could we? If you're moved to make your ow

• 05:12

### Ellipses | Punctuation | Khan Academy

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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

• 04:09

### Parentheses | Punctuation | Khan Academy

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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

• 04:51

### Hyphens vs. dashes | Punctuation | Khan Academy

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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

• 06:20

### Dashes | Punctuation | Khan Academy

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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-

• 03:13

### Using quotation marks in titles | Punctuation | Khan Academy

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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:

• 04:18

### How to use italics and underlines | Punctuation | Khan Academy

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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

• 10:57

### BONUS: History of the possessive apostrophe | The Apostrophe | Punctuation | Khan Academy

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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

• 05:40

### BONUS: History of the apostrophe | The Apostrophe | Punctuation | Khan Academy

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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

• 02:31

### Choosing between its and it’s | The Apostrophe | Punctuation | Khan Academy

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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

• 02:51

### Apostrophes and plurals | The Apostrophe | Punctuation | Khan Academy

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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

• 04:11

### Advanced (plural) possession | The Apostrophe | Punctuation | Khan Academy

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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

• 01:51

### Possession for words ending in “s” | The Apostrophe | Punctuation | Khan Academy

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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

• 03:45

### Introduction to the possessive | The Apostrophe | Punctuation | Khan Academy

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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

• 03:36

### Introduction to contractions | The Apostrophe | Punctuation | Khan Academy

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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/

• 04:50

### Introduction to the apostrophe | The Apostrophe | Punctuation | Khan Academy

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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

• 03:43

### BONUS: The Oxford comma | Punctuation | Grammar | Khan Academy

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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

• 03:00

### Appositives | Punctuation | Grammar | Khan Academy

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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

• 03:00

### Commas in dialogue | Punctuation | Grammar | Khan Academy

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“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

• 03:24

### More uses for commas | Punctuation | Grammar | Khan Academy

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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

• 01:51

### Punctuating a list | Punctuation | Grammar | Khan Academy

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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=

• 04:35

### Commas and introductory elements | Punctuation | Grammar | Khan Academy

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In English, you use commas to separate introductory elements from the rest of a sentence. Find out how with David and Paige! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/commas-an

• 03:19

### Commas in space and time | The Comma | Punctuation | Khan Academy

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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

• 02:18

### Salutations and valedictions | Punctuation | Grammar | Khan Academy

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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

• 03:59

### Meet the Comma | Punctuation | Grammar | Khan Academy

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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/

• 02:52

### Three ways to end a sentence | Punctuation | Khan Academy

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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

• 06:08

### Beginning sentences with conjunctions | The parts of speech | Grammar | Khan Academy

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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

• 03:12

### Correlative conjunctions | The parts of speech | Grammar | Khan Academy

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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

### Subordinating conjunctions | The parts of speech | Grammar | Khan Academy

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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

• 04:33

### Coordinating conjunctions | The parts of speech | Grammar | Khan Academy

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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

• 03:50

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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-

• 09:03

### BONUS VIDEO | Singular They | The parts of speech | Grammar | Khan Academy

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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

• 02:55

### Emphatic pronouns | The parts of speech | Grammar | Khan Academy

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Sometimes we use reflexive pronouns like "myself" and "ourselves" for emphasis in a sentence, like, "If you won't help me, then I'll do it myself!" KA's Grammar Fellow, David, explains this usage. Practice this yourself on Khan Academy right now: https://

• 05:03

### Indefinite Pronouns | The parts of speech | Grammar | Khan Academy

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David, Khan Academy's Grammar Fellow, covers three nifty features of indefinite pronouns, which are pronouns that are just a little vague, y'know? Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspee

• 05:18

### Pronoun number | The parts of speech | Grammar | Khan Academy

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The difference between something being singular or plural is what we call 'grammatical number' in English. Here's how that idea applies to pronouns! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofsp

• 04:39

### Grammatical person and pronouns | The parts of speech | Grammar | Khan Academy

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There's this idea in grammar called grammatical person that helps describe who's being talked about in a sentence. David, KA's Grammar Fellow, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/parts

• 05:34

### Subject and object pronouns | The parts of speech | Grammar | Khan Academy

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Before we get any further with pronouns, let's cover what the difference between a subject and an object pronoun is, because the distinction between those two concepts will start coming up a good deal. Practice this yourself on Khan Academy right now: htt

• 04:47

### Who versus whom | The parts of speech | Grammar | Khan Academy

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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

• 05:41

### That versus which | The parts of speech | Grammar | Khan Academy

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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

• 01:56

### Relative pronouns | The parts of speech | Grammar | Khan Academy

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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/

• 05:10

### Reflexive pronouns | The parts of speech | Grammar | Khan Academy

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We use reflexive pronouns (like "herself" and "ourselves") when the subject and the object of a sentence are the same thing. David, KA's Grammar Fellow, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/gra

• 04:52

### Possessive pronouns | The parts of speech | Grammar | Khan Academy

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We can use pronouns to show possession relationships, describing what things belong to which people, like "her shoe" or "the book is mine." Possessive pronouns come in two flavors: adjective and noun! David, KA's resident grammarian, covers the difference

• 03:15

### Personal pronouns | The parts of speech | Grammar | Khan Academy

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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

• 02:00

### What is a pronoun? | The parts of speech | Grammar | Khan Academy

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Pronouns are words that can replace nouns, like the way "it" replaces "elephant" in "I looked at the elephant. It was grey." Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/e/the-q

• 04:53

### Modal verbs | The parts of speech | Grammar | Khan Academy

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There's a class of helper verbs known as modals that we use to express a bunch of conditions: we can use them to give advice, make guesses at how necessary or likely something is, make requests of people, and so on. They're super useful. Practice this you

• 02:11

### Perfect progressive aspect | The parts of speech | Grammar | Khan Academy

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We use the perfect progressive aspect to talk about an action that was once ongoing, but has since completed, like "I had been waiting for twenty minutes." Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/pa

• 02:31

### Perfect Aspect | The parts of speech | Grammar | Khan Academy

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If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 02:45

### Progressive Aspect | The parts of speech | Grammar | Khan Academy

325 views / 0 likes - added

If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 01:32

### Simple Aspect | The parts of speech | Grammar | Khan Academy

318 views / 0 likes - added

If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 01:50

### Introduction to verb aspect | The parts of speech | Grammar | Khan Academy

337 views / 0 likes - added

If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 02:53

### The truly irregular verbs | The parts of speech | Grammar | Khan Academy

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Some irregular verbs just won't be categorized. They don't fit into neat little boxes. These are those verbs. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/e/intro-to-irregular

• 03:14

### The irregular verb gets taken for a ride | Grammar | Khan Academy

348 views / 0 likes - added

This group of irregular verbs have vowel sounds that change in a predictable way, when they go from the present to the past tense. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs

• 03:11

### The vowel-shift irregular verb | The parts of speech | Grammar | Khan Academy

323 views / 0 likes - added

This group of irregular verbs have vowel sounds that change in a predictable way, when they go from the present to the past tense. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs

• 01:53

### The funky -ed irregular verb | The parts of speech | Grammar | Khan Academy

358 views / 1 likes - added

These are the most regular of the irregular verbs; while they don't behave exactly like regular verbs, like present tense "walk" become past tense "walked", they do maintain the "-ed" sound. It's just spelled differently. Practice this yourself on Khan Ac

• 03:29

### Introduction to irregular verbs | The parts of speech | Grammar | Khan Academy

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Words like "walk" and "look" are regular verbs – they behave in a predictable way. But there's a whole class of words in English, called irregular verbs, that are harder to predict. David, KA's Grammar Fellow, explains. Practice this yourself on Khan Acad

• 03:02

### Linking verbs | The parts of speech | Grammar | Khan Academy

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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

• 02:54

### Helping verbs | The parts of speech | Grammar | Khan Academy

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We've established that verbs can show actions and link ideas together. Now, let's talk about how some verbs can be used to help other verbs. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/gra

• 02:50

### The future tense | The parts of speech | Grammar | Khan Academy

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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

• 02:00

### The past tense | The parts of speech | Grammar | Khan Academy

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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=

• 02:01

### The present tense | The parts of speech | Grammar | Khan Academy

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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

• 01:46

### Introduction to verb tense | The parts of speech | Grammar | Khan Academy

339 views / 0 likes - added

An understanding of verb tense will make you into a TIME WIZARD, with the ability to control the past, the present, and the future – with your words, anyway. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/

• 01:26

### Introduction to verbs | The parts of speech | Grammar | Khan Academy

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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

• 04:57

### Irregular plural nouns | foreign plurals | The parts of speech | Grammar | Khan Academy

368 views / 0 likes - added

You don't need to know how to speak Latin and Greek in order to understand English, but some words in English come from those languages. It's helpful to know how some Greek and Latin words change from singular to plural. Practice this yourself on Khan Aca

• 02:46

### Introduction to Grammar | Grammar | Khan Academy

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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

• 07:16

### Derivative as a concept

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Introduction to the idea of a derivative as instantaneous rate of change or the slope of the tangent line.

• 04:00

### Area of an isosceles triangle

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Area of an isosceles triangle

• 03:48

### Pythagorean theorem with right triangle

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Pythagorean theorem with right triangle

• 04:51

### Relating circumference and area

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Relating circumference and area

• 03:00

### Partial circle area and arc length

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Partial circle area and arc length

• 04:35

### Surface area word problem example

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Surface area word problem example

• 04:17

### How volume changes from changing dimensions

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How volume changes from changing dimensions

• 03:29

### Recognizing common 3D shapes

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Recognizing common 3D shapes

• 03:09

### Triangle missing side example

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Triangle missing side example

• 01:31

### Example finding area of triangle

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Example finding area of triangle

• 01:42

### Finding height of a parallelogram

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Finding height of a parallelogram

• 04:32

### Rounding to the nearest tenth and hundredth

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Rounding to the nearest tenth and hundredth

• 05:09

### Christopher Columbus

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Who was Christopher Columbus? In this video, Kim explores Columbus's background, his search for royal patronage, and his first voyage in 1492.

• 10:18

### Consequences of Columbus's voyage on the Tainos and Europe

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When Columbus arrived in the Caribbean, he met the Taino people. In this video, Kim explores the consequences of Columbus's voyage for the Taino people, as well as the changes wrought in Europe by Spain's New World exploits.

• 09:17 Popular

### The Columbian Exchange

1,105 views / 2 likes - added

Columbus's voyage connected the Americas, Europe, and Africa in a web of exchange that transformed the environments of the Old World and the New World.

• 03:41

### Example finding distance with Pythagorean theorem

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Example finding distance with Pythagorean theorem

• 03:37

### Sal teaches Grover about the electoral college

421 views / 0 likes - added

Sal helps our favorite Sesame Street character understand how we elect the president of the United States. Check out more lessons about American civics on Khan Academy at http://www.khanacademy.org. And vote November 8 if you’re eligible!

Featured
• 05:09

### Finding Units Of Rate Constant K

468 views / 0 likes - added

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

• 07:50

### Compound Prepositions | Prepositions | The Parts Of Speech | Grammar

331 views / 0 likes - added

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

• 05:38

### Prepositional Phrases | Prepositions | The Parts Of Speech | Grammar

362 views / 0 likes - added

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

• 05:16

### Prepositions Of Time | Prepositions | The Parts Of Speech | Grammar

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• 05:10

### Prepositions Of Space | Prepositions | The Parts Of Speech | Grammar

362 views / 0 likes - added

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

• 02:36

### Prepositions Of Neither Space Nor Time | Prepositions | The Parts Of Speech | Grammar

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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

• 03:49

### Meet The Prepositions | Prepositions | The Parts Of Speech | Grammar

354 views / 1 likes - added

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

• 04:29

### Passive Sign Convention

459 views / 0 likes - added

The sign convention for passive components defines what we mean by positive and negative voltage and current. It helps us get the signs right when we apply Ohm's Law.

• 05:28

### Current Direction

295 views / 0 likes - added

The positive sign for current corresponds to the direction a positive charge would move. In metal wires, current is carried by negatively charged electrons. The positive current arrow points opposite the direction the electrons move. This has been the sig

• 09:18

### Current

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Current is the flow of charge. We measure current by counting the amount of charge passing through a boundary in one second.

• 02:59

### Voltage Intuition

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Voltage is a cornerstone concept in electricity. We create an intuitive mental image by comparing voltage to gravity.

• 06:03

### Kirchhoff's Current Law

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Kirchhoff's Current Law says the currents flowing into a node must add up to zero.

• 06:39

### Voltage Divider

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The output voltage is a fixed fraction of the input voltage. The ratio is determined by two resistors.

• 06:44

### BONUS VIDEO | Terminal Prepositions | Prepositions | The Parts Of Speech

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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

• 05:14

### Intensifiers And Adverbs Of Degree | Modifiers | The Parts Of Speech

366 views / 0 likes - added

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

• 07:40

### Forming The Comparative And Superlative | Modifiers | The Parts Of Speech

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Learn how to form and use comparative and superlative modifiers.

• 05:49 Popular

### Adjective Order | Modifiers | The Parts Of Speech

915 views / 1 likes - added

• 03:23

### Relative Adverbs | Modifiers | The Parts Of Speech

443 views / 0 likes - added

Relative adverbs connect chunks of sentences together. Find out how that works!

• 04:14

### Definite And Indefinite Articles | Modifiers | The Parts Of Speech

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'A' and 'an' are the indefinite articles of English; 'the' is the definite article. David explains what that means!

• 02:48

### Intro To Articles | Modifiers | The Parts Of Speech

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Articles—words like the, a, and an—are special adjectives we use to indicate whether a noun is specific or not specific. David, Khan Academy's resident grammarian, explains.

• 04:10

### Intro To Adverbs | Modifiers | The Parts Of Speech

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Adverbs are a kind of modifier that you can use to change verbs or adjectives, like 'very' or 'carefully'.

• 03:32

### Introduction To Adjectives | Modifiers | The Parts Of Speech

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Adjectives are the words we use to modify nouns. David explains how, with the help of a bear.

• 04:11

### Intro To The Comparative And The Superlative | Modifiers | The Parts Of Speech

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Find out how to be "happier" or even "the happiest!" David, KA's grammarian-in-chief, explains how to compare nouns using comparative and superlative modifiers.

• 06:52

### Introduction To Partial Pressure | Gases And Kinetic Molecular Theory | Chemistry | Khan Academy

552 views / 0 likes - added

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

• 03:34

### Introduction To Agreement | Verbs | The Parts Of Speech

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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

• 11:48

### The Scientific Method

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The scientific method

• 04:34

### Biology Overview

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Biology overview

• 14:08

### Small X Approximation For Large Kc

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Guidelines and worked examples for using the small x approximation to solve equilibrium problems with large Kc values

• 09:40

### Small X Approximation For Small Kc

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When the small x approximation is useful for solving equilibrium problems, and an example using the small x approximation when Kc is small

• 10:44

### Buffer Capacity

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The definition of buffer capacity, and an example showing why it depends on the absolute concentrations of the conjugate acid and base.

• 06:52

### Least Common Multiples Of Polynomials

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Least common multiples of polynomials

• 06:31

### Proof - Sum of Measures of Angles in a Triangle are 180

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Proof that the sum of the measures of the angles in a triangle are 180

• 12:49

### Scientific Notation Examples | Pre-Algebra | Khan Academy

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• 02:36

### Number Patterns: Seeing Relationships | Applying Mathematical Reasoning | Pre-Algebra | Khan Academy

448 views / 0 likes - added

Laying the foundation for algebraic thinking by learning to recognize the relationships between patterns and graphing out those relationships. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/applyin

• 00:52

### Reading Bar Charts: Basic Example | Applying Mathematical Reasoning | Pre-Algebra | Khan Academy

450 views / 0 likes - added

Let's start with this bar chart that brings back the days of Harry Potter! Putting our toes in the water on this one... Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/applying-math-reasoning-topic/

• 07:34

### Hexadecimal Number System | Applying Mathematical Reasoning | Pre-Algebra | Khan Academy

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• 03:21

### Rational Number Word Problem With Fractions | Pre-Algebra | Khan Academy

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Word problems force us to put concepts to work using real-world applications. In this example, determine the volume of frozen water and express the answer as a fraction. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.o

• 02:48

### Adding In Binary | Applying Mathematical Reasoning | Pre-Algebra | Khan Academy

535 views / 0 likes - added

• 03:36

### Approximating Irrational Number Exercise Example | Pre-Algebra | Khan Academy

433 views / 0 likes - added

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/order-of-operations/rational-irrational-numbers/e/approximating-irrational-numbers?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Watch the nex

• 03:00

### Inverse Property Of Addition | Arithmetic Properties | Pre-Algebra | Khan Academy

538 views / 0 likes - added

The simple idea that a number plus its negative is 0 Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/order-of-operations/arithmetic_properties/v/inverse-property-of-multiplication?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra M

• 03:43

### Converting From Decimal To Hexadecimal Representation | Pre-Algebra | Khan Academy

381 views / 0 likes - added

• 02:36

### Converting Decimals To Percents | Decimals | Pre-Algebra | Khan Academy

416 views / 0 likes - added

Need to convert a decimal to a percent? Ok, we'll just use our fraction friends to get us there. Watch and be amazed. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-intro-p

• 02:35

### Dividing Whole Numbers And Fractions: Studying | Fractions | Pre-Algebra | Khan Academy

632 views / 0 likes - added

Solve a word problem by dividing a fraction by a whole number. The example used in this video is 1/5 ÷ 4. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/dividing-fractions-pre-alg

• 03:53

### Plotting Basic Fractions On The Number Line | Fractions | Pre-Algebra | Khan Academy

555 views / 0 likes - added

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/understanding-fractions-pre-alg/e/fractions_on_the_number_line_1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Watch the nex

• 04:00

### Finding Factors And Multiples | Factors And Multiples | Pre-Algebra | Khan Academy

540 views / 0 likes - added

To find the factors of a number means to find all the whole numbers that the number in question is divisible by. Can you help us find the factors in this example? Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math

• 05:27

### Converting Directly From Binary To Hexadecimal | Pre-Algebra | Khan Academy

388 views / 0 likes - added

• 06:56

### Exponents And Powers Of Zero Patterns | Pre-Algebra | Khan Academy

499 views / 0 likes - added

Now that we understand how to interpret an exponent and how the patterns in zeros are related to the exponent, we can solve more complicated problems! Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra

• 09:29

### Dividing Decimals With Hundredths Example 3 | Decimals | Pre-Algebra | Khan Academy

491 views / 0 likes - added

The old saying is "practice makes perfect." Let's keep practicing dividing decimals and making our divisor a whole number. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/dividing-d

• 02:27

### Inequality Word Problem: One Variable | Applying Mathematical Reasoning | Pre-Algebra | Khan Academy

406 views / 0 likes - added

This time we're creating a variable to represent a number, and then writing an inequality. We're building on our knowledge. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/applying-math-reasoning-to

• 04:51

### Cube Root Of A Non-perfect Cube | Pre-Algebra | Khan Academy

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• 03:45

### Visualizing Equivalent Fractions | Fractions | Pre-Algebra | Khan Academy

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To understand equivalent fractions it helps to "see" the fractions using something like a grid with shaded and unshaded sections representing the fraction. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-al

• 03:52

### Converting From Decimal To Binary | Applying Mathematical Reasoning | Pre-Algebra | Khan Academy

482 views / 0 likes - added

Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/applying-math-reasoning-topic/alternate-number-bases/v/large-number-decimal-to-binary?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Missed the previous lesson? https://www.khanaca

• 04:33

### Multiplying Negative And Positive Fractions | Fractions | Pre-Algebra | Khan Academy

503 views / 0 likes - added

See examples of multiplying and dividing fractions with negative numbers. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/multiplying-fractions-pre-alg/e/multiplying_fractions?utm_

• 02:32

### Dividing Whole Numbers And Fractions: Potpourri | Fractions | Pre-Algebra | Khan Academy

549 views / 0 likes - added

Solve a word problem by dividing a whole number by a fraction. The example used in this video is 4 ÷ 1/5. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/dividing-fractions-pre-alg

• 04:31

### Number Patterns: Interpreting Relationships | Pre-Algebra | Khan Academy

409 views / 0 likes - added

Examining the points on a number line and interpreting the patterns to discover the relationships. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/applying-math-reasoning-topic/number-patterns/e/vis

• 04:25

### Multiplying Challenging Decimals | Decimals | Pre-Algebra | Khan Academy

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Sometimes multiplying really small decimals (with all those zeros!) can be a little intimidating. Watch as we show you a handy trick to simplify these problems and solve them. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanaca

• 07:51

### Volume: How To Measure It | Measurement | Pre-Algebra | Khan Academy

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Volume is a measurement in the 3rd dimension. This means that it not only has width and height, but it has depth as well. Let's watch this video in which we get a great explanation of how we measure volume. Practice this lesson yourself on KhanAcademy.org

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### Mixed Numbers And Improper Fractions | Fractions | Pre-Algebra | Khan Academy

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Converting mixed numbers to improper fractions and improper fractions to mixed numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/mixed-numbers-pre-alg/e/converting_mixed_numb

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### Percentage Of A Whole Number | Decimals | Pre-Algebra | Khan Academy

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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

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### Multiplying And Dividing Negative Numbers | Pre-Algebra | Khan Academy

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Multiplying and dividing negative numbers Watch the next lesson: https://www.khanacademy.org/math/arithmetic/absolute-value/abs_value_tutorial/v/absolute-value-and-number-lines?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Missed the previous less

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