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# Archive | Math Concepts

## Learning from GRE Math Practice

I’m going to ask you a question whose answer seems painfully obvious. What is the purpose of doing practice GRE math questions? Take a minute to really consider that question in its entirety and explore the implications of your answer. If your answer was any of these, or something similar to these, then it’s too […]

## GRE Article of the Month – August 2014: The Game of Math

Don’t Teach Math, Coach It By Jordan Ellenberg for The New York Times In a recent New York Times article, Don’t Teach Math, Coach It, Jordan Ellenberg, a mathematic professor at the University of Wisconsin, talks about how to get kids excited about math. He starts off with a short anecdote about how the young […]

## GRE Math: A Rectangle & Parallelogram with Equal Area

Today, we’ll quickly look at how a rectangle and parallelogram can have the same area. In the diagram to the above, the parallelogram and rectangle share a vertex (D), one vertex of the rectangle (E) is on a side of the parallelogram, and one vertex of the parallelogram (C) is on a side of the […]

## Mean, Median and Mode on the GRE

Over the last six months, I’ve gone through quite a few Revised GRE prep books. One thing I’ve noticed missing is difficult questions relating to mean, median, and mode. Sure, most books describe how to find the average, and what the difference between the mean and the median. Many already know the above, but mean, […]

## Two Definitions of Exterior Angle in GRE Geometry

This may come as a surprise, but there is more than one way to classify an exterior angle. You will want to have both of these definitions in mind when dealing with questions on the test since both instances are possible. Don’t worry! It won’t be too difficult to remember. Type I: At each vertex, […]

## Special Quadrilaterals on the GRE

Today, we’ll cover special quadrilaterals and the facts that you should know. These will allow you to answer questions quickly and understand the basic nature of these shapes.   1) A Typical Parallelogram All parallelograms have the BIG FOUR properties: 1. Opposite sides are parallel—AB // CD, AD // BC 2. Opposite angles are congruent—∠BAD […]

## Does Order Matter? Combinations vs. the Fundamental Counting Principle on the GRE

When trying to decide whether to use the combination formula, many students have trouble applying the “does order matter” test–deciding if outcomes differ. It’s easy to say order doesn’t matter when it in fact does, and vice versa. Once you get it, it’s really useful, but it can take a bit of thinking and re-thinking. […]

## GRE Math – Exponent Challenge

A relatively common exponent question on the GRE will ask you to figure out the units digit of some number raised to an exponent, which usually results in a number roughly equivalent to the number of grains of sand in the Sahara, and thus out of reach of the GRE calculator. Take a look at […]

## GRE Math Practice Questions

Since readers are always asking for more GRE math practice, I’ve rounded up some of my favorite questions from Magoosh’s premium GRE prep to make them available to you for free. The truth is, when it comes to studying for GRE quant, you can never get your hands on enough practice questions. I’ve broken down […]

## How Many Data Interpretation Questions on the GRE?

For students who spend most of their time studying from the ETS book and the on-line paper-based tests, you are probably used to seeing four Data Interpretation questions per test. On the actual test, which has twenty questions per math section, there are only three Data Interpretation questions per section, leading to a total of […]