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## GRE Math: Rounding

What does it mean to round a number?  What do you have to know about rounding for the GRE?  Not many GRE questions will say, “Here’s a number: round it to the nearest such-and-such.”  By contrast, many questions, in the course of asking something else, could ask you to round your answer to the nearest [...]

## Positive and Negative Square Roots on the GRE

Practice problems First of all, consider these two similar, but not identical, QCs. All I will say right now is: despite apparent similarities, those two questions have two completely different answers.  The distinction between them is the subject of this article.   Do I include the negative root? Often, students are confused about this question.  [...]

## Breakdown of the Most Commonly Tested GRE Quant Concepts

The 2nd edition Official Guide has just been released. At the back of the book is a new test (GRE Practice Test 2). In general, the concept break down is not surprising, if you look at the concepts that pop up in Practice Test 1 (which is the same as the practice test in the [...]

## GRE Division, Mixed Numerals, and Negatives

This is a post to clarify a potentially confusing passage in the OG.  In the GRE OG 2e, on p. 134, we find the following passage about quotients and remainders. “If an integer n is divided by a nonzero integer d resulting in a quotient q with a remainder r, then n = qd + [...]

## GRE Quant: The Difference of Squares

If you’ve been studying GRE for some time, you’ve very likely encountered the following: . You may, however, only seen the following equation in the context of algebra. Nevertheless, the formula above applies to number properties. Let’s take a look. While you may be tempted to make a mad dash at it, calculating each of [...]

## GRE Exponents: Practice Question Set

Each of the math questions below is directly inspired by a question in the on-line Revised GRE test. I’ve provided an easier version of the question (#1) and a more difficult version of the question (#2). My recommendation is to try the easier version first. Then, if you answer it correctly, click on the link, [...]

## GRE Math: Absolute Values

On average you will see at least one question on the Revised GRE dealing with absolute values. You may even see a few. Yet, absolute value gets lost in the prep fray amongst the more popular concepts. So if you don’t want this relatively innocuous concept to surprise you test day read on.   What [...]

## GRE Math Basics: Quick Tips

Prime numbers 2 is the smallest prime number 2 is the only prime even number 1 is not a prime 3, 5, 7 are the only odd consecutive sequence of three integers   Digits In the integer 5,432, 5 is the thousands digit, 4 is the hundreds digit, 3 is the tens digit, and 2 [...]

## Integer Properties Multiple Choice: Practice Question of the Week #25

Here’s this week’s practice question: there’s only one correct answer. We’ll be posting the answer tomorrow, good luck! How many odd, positive divisors does 540 have? A. 6 B. 8 C. 12 D. 15 E. 24   Update: Here’s the answer/explanation post!