### Using Smart Numbers for GRE Quant

Here’s a quick cheat sheet on how, when, and why to use Smart Numbers to solve GRE Quant problems. Read more

### Two GRE Math Terms to Banish from Your Lexicon

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**There are a few math terms that are banned from my GRE classroom. “I’m not a math person” is a big one. So is “You either know it, or you don’t.” Both of those sentences are untrue—they don’t describe how the human brain really works—and they’re also dangerous.**

The words that we choose are important. If we want to succeed on the GRE, we should talk about our learning in a way that reflects that. And if we want to do GRE Quant problems clearly and methodically, we should also talk about them clearly and methodically. That’s why, in addition to the “dangerous” math terms up there, there are a couple of other “dirty words” that I’ve banned from my classroom. If you cut these words and phrases out of your GRE Quant vocabulary, I promise that you’ll make fewer careless errors, understand problems more clearly, and feel more confident about your solutions. Read more

### More Fun with GRE Variables

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**In my last blog post, we practiced using variables to solve Quant word problems—and we solved some problems ***without* using variables, too. The big takeaway: you don’t have to start every word problem with a tidy little list of variables and equations! It’s okay to focus on the *numbers* in the problem first. However, variables are sometimes the key ingredient to getting a GRE problem right. In this article, we’ll try using variables to solve some tougher GRE Quant word problems.

Here’s one of my favorite problems from the 5lb. Book of GRE Practice Problems. Give it a try before you keep reading: Read more

### GRE Math for People Who Hate Math: Absolute Value

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**Think of an absolute value as a simple machine that looks like this: ||. You put a value into it, and the machine answers a single question for you: how far away from zero was the value that you put in?**

The basic operation of the machine is simple. Take any number, put it into the machine, and find out how far from zero that number is. The absolute value of 12, |12|, is equal to 12. The absolute value of -10, |-10|, is equal to 10. That’s because -10 is 10 units away from zero.

It starts to get complicated when the GRE asks you to put things into the machine that are more complex than simple numbers. Imagine that somebody else is operating the machine. She puts values in, but she doesn’t tell you what those values are. All you can see is the *answer* that the machine gives when it receives those values. Read more

### Solving GRE Problems in Multiple Ways to Build Flexibility

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**Recently, my colleague Tom and I decided that, since we were teaching in adjacent classrooms, it might be fun to combine our classes and co-teach a lesson. Tom and I have very different strengths, both as test-takers and teachers. I love algebra, and I’ll always seek out an algebraic solution to a problem (even when this might not be the most efficient method—my strength is also a weakness). Tom prefers non-algebraic methods, like drawing diagrams or picking numbers. And our strengths inform what we emphasize in class.**

So, for our joint lesson, we chose a number of GRE problems that could be solved in more than one way, and then took turns demonstrating each method. First, we each used the method we preferred (algebra for me, picking numbers for Tom), and then we switched and demonstrated the method we were less comfortable with. Here’s one of the GRE problems we used: Read more

### 7 Ways to Avoid Careless GRE Math Errors

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There’s nothing wrong with making GRE math errors because the problem is too hard. That’s just the way that the test is designed—there are Quant questions on the GRE that will challenge even the mathematical geniuses among us. However, it’s much more frustrating to miss a problem that you could’ve gotten right, just because you made a silly mistake. Try out the following tips to cut down on careless GRE math errors. Read more

### GRE Percentage Problems – Part 2: Percent Increase and Percent Decrease

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If you’ve been following this blog for a while, you’ve probably read our article on how to handle GRE percentage problems. That article teaches you an ultra-simple approach for “percent of” Quant problems — that is, problems like the following:

*xy* is 20% of *z*. In terms of *y*, what **percent of** *x* is *z*? Read more

### A Step-by-Step Guide to ‘Multiple Workers’ GRE Rates Problems

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*Nine identical machines, each working at the same constant rate, can stitch 27 jerseys in 4 minutes. How many minutes would it take 4 such machines to stitch 60 jerseys?*

First, take a deep breath. In this article, you’ll learn a methodical approach that will work on GRE rates problems every single time. On test day, it’ll be tempting to throw away your new habits and go back to old ones. Try to do the opposite. You’ve done all of this studying for a reason!

On problems like this, don’t try anything fancy. A lot of GRE test-takers will try to logically reason their way through this problem, saying something like “well, if 9 machines stitch 27 jerseys in 4 minutes, then 3 machines stitch 9 jerseys in 12 minutes…” That approach is valid but dangerous. Whenever you choose not to write something down, you’re taking away your ability to check your work for mistakes. (By the way, where’s the mistake in the logic described above?)

To start the problem, make a table. Your scratch paper should look like this: Read more

### Let’s Have Fun with GRE Exponents

You may already know the basic rules of exponents for the GRE. These rules tell you what to do if you want to multiply or divide two exponential numbers, or raise an exponent to another power. Once you’ve memorized them, exponent problems become *exponentially* easier (I’m so sorry). But there are two types of exponent problems that many students find intimidating, because the basic rules just don’t seem useful. In this article, we’ll go over those two problem types, how to recognize them, and what to do if you see one. Read more

### Here’s How to Create Your Own GRE Quant Cheat Sheet

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