Understand the properties of the GMAT Quantitative section’s two favorite triangles!  The two special triangles are right triangles with special angles and side.  Like all right triangles, they satisfy the Pythagorean Theorem.  These two triangles are “special” because, with just a couple pieces of information, we can figure out...

Two of the more confusing tenses in English are the present perfect and the past perfect. What makes them so is both describe continuous actions. To illustrate, let’s take a look at the following sentences: 1.) Last night, I walked my dog. 2.) I have walked Bucky...

Concision is one of the goals of parallel structure.  Consider the following monstrosity of a sentence. 1a) After I get my next paycheck, I am seriously thinking about buying a jet ski, I am seriously thinking about treating my friends to dinner, and I am seriously...

“I don’t know if you will find this post helpful” Do you spot the error in the preceding sentence?  This error is common in casual spoken English, but it will cost you on the GMAT Sentence Correction.  In that sentence, the word “if” is incorrect: it...

The 45º angle Fact: All lines with slopes of 1 make 45º angles with both the x- and y-axes. Conversely, if a line makes a 45º angles with either the x- of y-axes, you know immediately its slope must be . This first fact is true, not only...

You may remember this formula, one of the sleekest factoring tricks in all of algebra: This formula, called “the difference of two squares” formula, is a favorite of standardized test writers.  A simple enough pattern: see if you can detect where it shows up in the...

Here’s a whirlwind tour of one of the most frequently tested sets of concepts on the GMAT Quantitative section. You don’t have to be an expert on statistics: a little goes a long way.   The Mean The mean is just the ordinary average: add up all the items...

The title of this post may seem facetious.  After all, even the person most allergic to math, most traumatized by math, still remembers how to count!  The GMAT, of course, generally will not ask you, for example, to count from one to seven.  The GMAT...

Think about what distinguishes an effective manager from a pencil-pusher.  The dutiful pencil-pusher can verify: A is a fact, B is a fact, and C is a fact.  The effective manager can say, well, if we know A & B & C, it would not...

We’ve just released our new eBook, and it’s on Integrated Reasoning! It includes: An overview of the section as a whole, including scoring Overviews and strategies of/for each question type Practice questions of each question type Recommendations for what and how to study to do your best on this new...