If you're enjoying our video course, help spread the word on Twitter.

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

- Study Guide
- Office Hours
- Extras
- Guarantees
- Prices

## Comment on

General GMAT Math Strategies## GMAT practice question

## I agree. Lots of different

I agree. Lots of different ways to solve that question.

## If I do not know how many

## Perfect reasoning!

Perfect reasoning!

## Hi Brent,

I found these SC flash cards. https://www.slideshare.net/GMATPrepNow_free/interactive-sentence-correction-flashcards-by-gmat-prep-now

Amazing work!!! Is there another for Math section? Need one for my last day preparations.

Thanks

## We have GMAT Math flashcards

We have GMAT Math flashcards here: https://www.slideshare.net/GMATPrepNow_free/gmat-math-flashcards

Cheers,

Brent

## Thanks! very helpful!

## Hello Brent,

Can you help with the following question please! Thanks

(-1.9)(0.6) – (2.6)(1.2))/6.0 = ?

A) -0.71

B) 1.00

C) 1.07

D) 1.71

E) 2.71

## You bet!

You bet!

We can apply the halving-doubling strategy (explained here: https://www.gmatprepnow.com/module/general-gmat-strategies/video/1113)

Let's deal with the NUMERATOR first.

Applying the halving-doubling strategy, we can write the following:

(2.6)(1.2) = (5.2)(0.6)

So, we get: (-1.9)(0.6) – (2.6)(1.2) = (-1.9)(0.6) – (5.2)(0.6)

= 0.6(-1.9 - 5.2) [I factored out the 0.6]

= 0.6(-7.1)

Now the ENTIRE FRACTION....

(-1.9)(0.6) – (2.6)(1.2))/6.0 = (0.6)(-7.1)/(6.0)

= (0.6/6.0)(-7.1)

= (1/10)(-7.1)

= -0.71

Cheers,

Brent

## Now comes the 10-second

Now comes the 10-second solution!

When we scan the answer choices (ALWAYS scan the answer choice before performing any calculations), we see that only one answer choice is NEGATIVE (hmmmm!!!)

In the numerator we have: (-1.9)(0.6) – (2.6)(1.2)

(-1.9)(0.6) is NEGATIVE

And (2.6)(1.2) is POSITIVE

So, (-1.9)(0.6) – (2.6)(1.2) = NEGATIVE - POSITIVE

= NEGATIVE

So, the numerator is some NEGATIVE number

The denominator (6) is a POSITIVE number

So, the entire fraction becomes NEGATIVE/POSITIVE, which evaluates to be NEGATIVE.

In other words, the entire fraction has a NEGATIVE value

Since answer choice A is the only NEGATIVE answer choice, it must be the correct answer.

Cheers,

Brent

## Thank you so much. this video

## Glad to hear that!

Glad to hear that!

## Add a comment