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GMAT Tuesdays with Kevin: Problem Solving – Co-Prime

Hello! This week, we’re tackling the GMAT math through a question that a student brought up. At first, the problem seems like a plug-and-chug kind of problem. But with the help of a crucial insight, this problem can be solved much quicker! Watch the video to find out what that insight is. Here’s a still […]

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Rates and Ratios

Rates are just ratios.  Here are a four problems exploring rates.  Remember: no calculator! 1) Someone on a skateboard is traveling 12 miles per hour.  How many feet does she travel in 10 seconds?  (1 mile = 5280 feet) 60 88 120 176 264 2) At 12:00 noon, a machine, operating at a fixed rate, […]

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GMAT Tuesdays with Kevin: How to Make a Multiplier

Hello! There’s an easy and straightforward 3-step process to making multipliers, but that simple skill will come in very handy on the GMAT! This week, learn how this 3-step process and then put it to work on an actual problem. You can take a look at the final board work here: And, you can also […]

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Circle problems on the GMAT

Here are eight practice problems involving circles.  The difficulty of these problems ranges from medium to very challenging. 1) In the diagram above, O is the center of the circle and angle AOB = 144º.  What is the area of the circle? Statement #1: The area of sector AOB is 40% of the area of […]

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Asking Excellent Questions

Success on the GMAT depends on many skills, and one skill that can help a student make enormous progress is the skill of asking excellent questions.  In order to discuss this skill, first let’s look at a relatively straightforward practice problem. 14 26 28 32 38 I will show a full solution at the bottom […]

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Practice Problems on Powers and Roots

Here are ten reasonably challenging problems on powers and roots.  Solutions follow the problems.   Remember, no calculator! Statement #1: x < 1 Statement #2: x > –1 4 8 14 28 42 5) If A is an integer, what is the value of A? 11 30 45 75 225   Powers & roots This is […]

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GMAT Practice Questions with Fractions and Decimals

Here are ten problems on fractions and decimals, some of which are quite challenging.  Remember, no calculator! 0.1 1 10 100 1000 6)  Suppose you have access to a large vat of distilled water, several gallons large.  You have two precise measuring pipettes, one to measure exactly 1/3 of an ounce and one to measure […]

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GMAT Tuesdays with Kevin: Challenge Question — Tour through Geometry

  Hello! This week, I’m solving a tough challenge question that you might have seen on our blog if you visit often! This challenge question draws on a whole host of geometry concepts and formulas, so it’s a great test for how much of geometry you really know. And just in case the board isn’t […]

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Consecutive Integers and Multiples on the GMAT

To begin, here are four reasonably challenging practice problems. 1) S is a set of n consecutive positive integers.  Is the mean of the set a positive integer? Statement #1: the range of S is an even integer Statement #2: the median of S is a positive integer 2) If N = 255 is the […]

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GMAT Geometry Practice Problems

1) A triangle could possibly intersect a circle at the following number of points: I. 3 II. 4 III. 5 I only I & II only I & III only II & III only I, II, III 2) Each circle in the diagram above has a radius of r = 6.  What is the total […]

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