Lesson: Multiplying by Doubling and Halving.

Reinforcement Activities

  • 175 flashcards for the quantitative sections of the GRE (you can also download this resource to your smartphone (for offline viewing) via this SlideShare page)

Comment on Multiplying by Doubling and Halving.

Tabish Badar's picture

Tabish Badar - October 28, 2016
What a classic strategy!
greenlight-admin's picture

greenlight-admin - October 28, 2016

Thanks - glad you like it!

JUNAID . AHMAD - March 14, 2017
Wow!! impressive

allysure - June 3, 2017
Extremely useful technique. This is my first time hearing about this. Thanks Brent!

suraj16 - June 8, 2018
Excellent technique, will come in handy while dealing with small number.

sahirsharuz1990 - November 1, 2018
They will never teach you this in Kap, Man-P, and Prince. Just saying. I was fortunate to pay for those super expensive courses both online and live. There are several ways to skin a cat and boy was I learning to skin the cat the wrong way all this time. It was always quantity oppose to quality for those super expensive bureaucratic test prepping models. Thank you Greenlight Test Prep and Brent for differentiating profoundly from your competitors.
greenlight-admin's picture

greenlight-admin - November 1, 2018

Thanks for taking the time to say such nice things! It made my day!

Cheers,
Brent

sahirsharuz1990 - November 1, 2018
Brent, you are absolutely welcome my friend.

sofia17 - December 1, 2018
This technique only works for even numbers?
greenlight-admin's picture

greenlight-admin - December 2, 2018

Good question.

The technique works for all numbers, but it doesn't always make calculations easier.

For example, the product of 19 x 11 EQUALS the product of 38 x 5.5, but the second product isn't necessarily easier to calculate.

Conversely, the product of 18 x 4 EQUALS the product of 9 x 8. In this case the second product is probably easier to calculate.

As I mention in the video, the technique works really well when one value ends in 5.
For example, the product of 35 x 18 EQUALS the product of 70 x 9, and the second product is easier to calculate.

Cheers,
Brent

seena - August 3, 2023
GRE practice question (difficulty level: 130 to 149)

How to get in to this link?I joined with user ID .But it is showing "You are not authorised to read this forum."
greenlight-admin's picture

greenlight-admin - August 3, 2023

Sorry about that. A few months ago, ETS made the forum remove all official GRE questions. Looks like I forgot to remove that official question.

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