Lesson: Operations with Fractions

Comment on Operations with Fractions

Interesting

This AWFUL-LOOKING fraction... LOOOOOL!

So right on the money!
greenlight-admin's picture

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

Cheers,
Brent

Are the official GRE paper test reinforcement activity questions from an older version paper test or from the version that has significant overlap with the 2 powerprep practice tests?
greenlight-admin's picture

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 any specific problems. It just takes you to the homepage of themathpage.com
greenlight-admin's picture

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 subtraction in mixed fractions ?
greenlight-admin's picture

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?
greenlight-admin's picture

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.

Add a comment

Ready for Test Day?

Try to achieve your target scores on at least two practice tests before taking the official test. 

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Free “Question of the Day” emails!