Have questions about your preparation or an upcoming test? Need help modifying the Study Plan to meet your unique needs? No problem. Just book a Skype meeting with Brent to discuss these and any other questions you may have.

- Video Course
- Video Course Overview
- General GMAT Strategies - 7 videos (free)
- Data Sufficiency - 16 videos (free)
- Arithmetic - 38 videos
- Powers and Roots - 36 videos
- Algebra and Equation Solving - 73 videos
- Word Problems - 48 videos
- Geometry - 42 videos
- Integer Properties - 38 videos
- Statistics - 20 videos
- Counting - 27 videos
- Probability - 23 videos
- Analytical Writing Assessment - 5 videos (free)
- Reading Comprehension - 10 videos (free)
- Critical Reasoning - 38 videos
- Sentence Correction - 70 videos
- Integrated Reasoning - 17 videos

- Study Guide
- Your Instructor
- Office Hours
- Extras
- Prices

## Comment on

Multiplying by Doubling and Halving## I'm really enjoying these

## Great to hear, we are glad

Glad to hear you're enjoying them!

## Great techniques. Thank you

## Thanks for that!

Thanks for that!

## After this video, I had an

## Good to hear!

Good to hear!

## Thank you

## very cool, thanks

## Very good and simple

I liked it very much and it is very easy..

Thank you very much for explaning this technique..

## nice .. i am gaining

## are the se all videos enough

## Yes, our course covers every

Yes, our course covers every concept and strategy necessary to beat the GMAT.

## This is a great strategy!

Thanks!

## Although it has been more

## Glad to hear it!

Glad to hear it!

## Just to confirm this only

## That's correct.

That's correct.

## good video

## Alternatively, prime

## Yes, we could! That concept

Yes, we could! That concept is covered later in the course, so I didn't discuss in this video.

## These videos are such helpful

## Very easy and interesting

## Why did I never knew this

## Wish they taught math in

## Another brilliant video!!

## do you have slides for the

## We have 2 sets of flashcards

We have 2 sets of flashcards (for GMAT math and GMAT critical reasoning) that are taken from slides of the course.

They can be found here: https://www.gmatprepnow.com/content/free-content

Cheers,

Brent

## Not to sound stupid, but

## Great question! I hadn't

Great question! I hadn't thought of that.

Since a ÷ b is the same as a/b, we can apply some nice fraction rules to division.

For example 17.5 ÷ 2.5 = (17.5)/(2.5)

Notice that we can take (17.5)/(2.5) and multiply top and bottom by 2 to create an EQUIVALENT fraction 35/5, which is much easier to evaluate.

So, 17.5 ÷ 2.5 = (17.5)/(2.5) = 35/5 = 7

So, if it helps us, we can take ANY division and multiply both parts by the same value to create an easier division.

Here's a quick one: 21/5 ÷ 7/5

If we multiply both parts by 5, we get: 21 ÷ 7, which is much easier to deal with.

Cheers,

Brent

## Very helpful. Thank you so

## This is very useful. I have

## the video is not working

## It works for me. Also, Vimeo,

It works for me. Also, Vimeo, my video host, has not experienced any issues.

Can you please clear the cache of your Web browser, then restart your computer and see if that resolves the issue. Also, can you try another Web browser and see what happens?

Here are the instructions for clearing your cache: https://kb.iu.edu/d/ahic

Note: you need not clear your cookies or your browsing history.

A little more information about the issue will help resolve the problem as soon as possible.

## Add a comment