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# Archive | *GRE Algebra

## What Unit Conversions Should You Know For The GRE?

Many times, if units are involved in a GRE Math question, the question itself will supply the relative conversions.  Sometimes, though, it expects you to have a few basic ones memorized.  What should you know?   The very basic, very common conversions Even the ones in this category, the test may supply, but sometimes it […]

## 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, as well as in ETS’s GRE Mathematical Conventions PDF on p. 5, point 9, we find a paragraph discussing quotients and remainders that utilizes the formula n = qd + r. This formula pertains […]

## Inverse Proportions on the GRE: The Flip It Method

Dealing with percent and word problems is always difficult. First off you have to understand what the question is asking for, then you have to set up what you believe is an equation that will help you quickly derive the answer. Each of the questions below tests the following concept: if one thing increases by […]

## Quantitative Comparison and Manipulation

Many quantitative questions have variables in both columns. While your first instinct may be to work algebraically, this strategy is not always best. Often the fastest way to a solution is by plugging in different values to see which column is greater. Developing a sense of when to plug in and when to solve algebraically […]

## 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: Inequalities

The inequality sign is far more intimidating than it need be. In many cases, just think of the inequality sign as an equal sign. Which case that is will be described below – along with the instance in which you have to switch the sign. But with a little bit of practice, inequality should be […]

## Strange Symbols in GRE Math Operations

Quite possibly the most intimidating problem on the GRE contains strange symbols: @, #, *, or a black circle often accompany these problems. Many recoil in horror thinking – I’ve never learned that before! (Or perhaps more aptly, what the @#?!) But don’t despair – the symbols are completely arbitrary and are defined on the […]

## Systems of Equations on the GRE

The Power of Elimination How would you solve the system of linear equations below?                    x – y = 5                    2x + y = 13 There are two primary approaches for solving systems of linear equations: 1)   Substitution Method 2)   Elimination Method   The Substitution Method With this method, we take one of the […]

## GRE Quantitative Comparison Tip #3 – Logic over Algebra

In previous posts (Tip #1 – Dealing with Variables, Tip #2: Striving for Equality), I have discussed two approaches when tackling Quantitative Comparison (QC) questions involving variables. Those approaches are: 1) Apply algebraic techniques 2) Plug in numbers In those posts, I noted that the algebraic approach is typically the faster and more reliable approach. […]