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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 [...]

## Proportions on the GRE

Proportions are extremely common on the GRE. If you don’t have a strong grasp of them, and you are busy trying to figure out combinations/permutations or probability, stop. Focus your attention on mastering proportions before moving on to more tertiary concepts. So let’s start basic. Proportions can be broken up into two groups: direct proportions [...]

## GRE Math: Ratios

Ratios are one of those concepts that can pop up in just about any GRE problem. You could have the ratio between two angles that form from intersecting lines. You could have the ratio of rates a person drove at. With such a broad application, ratios are one of the concepts it is imperative you [...]

## 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 [...]

## GRE Math Video Lessons: Series and Counting Basics

A relatively popular concept on the GRE math is series – when you have a list of numbers that follow a certain pattern(e.g. consecutive numbers). Usually, the question will ask you to add up all the numbers that are part of the series. Today, we are not going to go quite so far. Instead, we are going [...]