GMAT Primes and the “Magic” of the Number 2
Numbers play an important role on the quantitative section of the GMAT, for obvious reasons, and arguably the most important numbers tested are prime numbers. As a reminder, a prime number is any number whose only two factors are 1 and itself. The first ten prime numbers, which you should know for the GMAT, are […]
Solving GMAT Factorials
GMAT problem solving questions that contain the words “How many ways…?” may land you in a situation where you have to deal with factorials. Of course, we have useful strategies for getting certain of these types of questions right without resorting to combinatorics. However, sometimes the fastest and easiest way to answer these questions is […]
Why Thomas Paine Would Have Crushed the GMAT
How Using a Little Logic and Common Sense Can Help You Get More Right Answers on GMAT Test Day In 1776, the great American patriot Thomas Paine wrote his famous pamphlet Common Sense, which inspired people in the Thirteen Colonies to declare and fight for freedom and independence from Great Britain. In it, he laid […]
GMAT Math – Inequalities with Two Variables
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Inequalities on GMAT problem solving questions are pretty straightforward. In their most basic form, you solve an inequality almost exactly like you solve an equation, remembering to reverse the inequality sign if you end up multiplying or dividing by a negative number. Nothing earth-shattering there. But what about more difficult GMAT inequalities involving two variables? […]
GMAT Math Tip – Trapezoids
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For whatever reason, trapezoids tend to freak students out on the GMAT. Maybe it’s because the formula for finding the area of a trapezoid doesn’t “look” like all the other quadrilateral formulas. Maybe it’s because trapezoids have a bizarre looking shape. Whatever the reason, I’d like to make your life a whole lot easier as […]
GMAT Mixture Problems (Algebraic Solution)
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Mixture problems (dry or chemical) are a common type of word problem tested on the GMAT. They all work essentially the same way and are relatively easy once you know what you’re supposed to do. In my video lesson “Problem Solving — Common GMAT Word Problems,” I teach a non-traditional strategy for solving mixture problems […]
The Power of Common Sense
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In 1776, Thomas Paine wrote Common Sense, which became the moral and intellectual touchstone for the American colonists struggling for independence from England. What does this have to do with the GMAT? Nothing politically, of course. But the concept of using common sense to eliminate clearly wrong answers is a remarkably powerful concept on the […]
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