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## Comment on

Operations with Fractions## Iteresting

## This AWFUL-LOOKING fraction..

So right on the money!

## Ha! Awful indeed! (aside:

Ha! Awful indeed! (aside: Omar is referring to 7:14 in the video)

Cheers,

Brent

## Are the official GRE paper

## I believe that the questions

I believe that the questions in the paper test do not overlap with the PowerPrep practice tests.

## The last 3 links don't go to

## Thanks for pointing that out!

Thanks for pointing that out!

Looks like TheMathPage.com changed the urls of all its pages.

I've updated all of the links above, and I'll try to get to the rest of the links (throughout this site) this upcoming week.

Cheers and thanks again,

Brent

## What about Addition and

## Good question. One option is

Good question. One option is to convert both to entire fractions, and then perform the calculations.

Cheers,

Brent

## Hi Brent,

When trying to find the common denominator for 1/3 + 1/6, isnt the common number that divides both 3 and 6 are 3?

I mean 3 is a multiple of both 3 and 6 right?

## 3 is the GREATEST COMMON

3 is the GREATEST COMMON DIVISOR of 3 and 6.

When it comes to adding or subtracting fractions, we want to find the LOWEST COMMON DENOMINATOR, which is the same as finding the LEAST COMMON MULTIPLE.

Sum of multiples of 3 are: 3, 6, 9, 12, 15, 18, 21,....

Sum of multiples of 6 are: 6, 12, 18, 24,30,....

(Aside: Notice that 3 is not a multiple of 6)

Among the above multiples, the SMALLEST multiple they have in COMMON is 6.

## When cross simplifying, is it

EX: 5/25 * 5/3

You can 5 & 25, but you can't simplify 5 & 3. So if I simplified 5 & 25 without simplifying 5 & 3, would that mess up my answer?

## No, you need not simplify

No, you need not simplify both pairs of values.

For example, 7/12 x 24/13 becomes 7/1 x 2/13 after simplifying.

Likewise, 25/8 x 11/15 becomes 5/8 x 11/3 after simplifying.