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Advice on greater than less than, and equal too on fractions(5-6 grd.)

+6 votes
2,990 views
asked Nov 29, 2016 in Ask ✨22CutePandiL☺U✨ by ❤☮LouTheLuver☮❤ (160,550 points)
edited Dec 26, 2016 by ❤☮LouTheLuver☮❤
There are may ways on telling which fraction or ratio is largest. There is the LCD (least common denominator), percentages, visualization, and criss-cross multiplication. Here are some ways to tell which fraction is greater.

1. LCD
So most people know what least common multiple, right?
Least Common Multiple- The smallest number two or more numbers share.
LCD is the same thing except the LCM is the denominator. For example let's say our two fractions were 7/8 and 8/9. If we look at the two denominators, they're both 8 and 9. Now we have to find the LCM of the two numbers.
8•9= 72
Our LCM is 72. So now we have to change the numerators to the numbers we multiplied to get the denominator 72.
7/8•9/9=63/72 (7 *9 and 8*9)
8/9*8/8=64/72 (8*8 and 9*8)
Now your new fractions that can be reduced to your regular fractions (7/8 and 8/9) are now 7/8=63/72 and 8/9=64/72. You can easily see the greatest fraction is 64/72 or 8/9 because 64 is greater than 63.

2. Percentages
From fourth grade, all of you are supposed to know your percents and what fraction and decimal they equal. We could easily tell which fraction is greater by turning them into percents. So let's say we have 4/5 and 2/3. We could easily tell which one is greater by turning them into percents.
4/5=80%
2/3=66 2/3%
As you can see, the greatest fraction out of 4/5 and 2/3 is 4/5.

3. Visualization and explanation
This way is for people who like to be thorough in their math. For this way you'll need a fraction chart of all of the fractions from parts to 1/2 to 1/12.
Let's say we have the fractions 1/3 and 3/5. If we look on the fraction diagram 3/5 should be your answer. Your explanation should be close to this.
Ex. 1-3/5 is greater than 1/3 because on the fraction diagram for 3/5, you only have 2/5 more to get to a whole. For 1/3 however you'll need 2/3 more to get to a whole. Since 2/5 is a smaller amount to get to a whole than 1/3, 3/5 is greater.
4. Criss Cross Multiplication
This is a real shortcut in math when you're in a big hurry. Since I can't explain it or draw it very well here's a link that could help you.

https://www.mathsisfun.com/algebra/cross-multiply.html

If you have any questions, need any help or have any more advice to add please comment or answer below! Hope these tips are useful!


1 Answer

0 votes
answered Oct 21, 2019 by Kitten (534,330 points)
Ima suprised how many of lou's questions did not get answered till I answered in 2019

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