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## How to do GMAT Math Faster

One complaint of some folks studying for the GMAT is: “I know a good deal of math.  I could do most of the math problems on the GMAT if I had enough time, but I often don’t see the quick ways to do these problems. How do I see the shortcuts?”  This post is an [...]

## Simplifying Math with Substitution on the GMAT

This post discusses a strategy for simplifying complex mathematical expression on the GMAT Quantitative section.  Consider the following very challenging Data Sufficiency question.   1. What is the value of x? Take a moment to wrestle with this before reading this article, in which we will explain how to approach this.   Complex Equations on the GMAT [...]

## When to Guess on the GMAT?

When should I just guess and move on? This has to be one of the most common questions my students pose when preparing for the GMAT and learning how you should study for GMAT math. Because the test can’t tell the difference between a guessed correct answer and well worked out correct answer, it’s important [...]

## Mathematical Thinking on the GMAT

What does the GMAT Quantitative section test?  Math, of course.  As tautological as that may seem, there is a very subtle point here.  What exactly is math?   Mathematics Strange as it may seem, there is no generally accepted formal definition of the word mathematics.  Most of the dictionary definitions, for example, cover the more [...]

## GMAT Probability and Counting Techniques

This is the third in a series of probability articles for the GMAT Quantitative Section.  In the first, I discussed the “AND” and “OR” rules for probability.  In the second, I discussed the “complement rule” and how to use this to solve “at least” problems in probability.  For a warm-up, here are some challenging GMAT [...]

## Number Sense for the GMAT

First, a practice problem. Remember, no calculator. I.   II.  III.  1) Rank those three in order from smallest to biggest. I, II, III I, III, II II, I, III II, III, I III, I, II   Number sense Many GMAT Quantitative Problems, like the foregoing one, test number sense.  What is number sense?  Number [...]

## Doubling and Halving Trick for GMAT Math

Learn one of the handiest tricks for math without a calculator!   Without a calculator, what is 1. 35 x 12? 2. 150 x 36? 3. 125 x 84? On the GMAT, you don’t get a calculator. With the doubling and halving trick, all of these become much easier.   Thinking about multiplication Every positive [...]