Articles by GMAT Prep Now

    The GCD/LCM Formula

    The GCD/LCM Formula

    by on September 14th, 2015

    In the last two articles, we learned how to find the greatest common divisor (GCD) and the least common multiple (LCM). In this video, we examine a nice formula that shows the relationship between the GCD of and the LCM … Read More

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    Least Common Multiples on the GMAT

    Least Common Multiples on the GMAT

    by on September 13th, 2015

    In this video, we examine two useful strategies for finding the least common multiple (LCM). We also practice finding pairs of numbers with a certain LCM. To help reinforce the concepts you learned in the video, try … Read More

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    Greatest Common Divisors (Factors) on the GMAT

    Greatest Common Divisors (Factors) on the GMAT

    by on September 12th, 2015

    In this video, we examine two different strategies for finding the greatest common divisor. We also practice finding pairs of numbers that have a certain greatest common divisor. To help reinforce the concepts you … Read More

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    Squares of Integers on the GMAT

    Squares of Integers on the GMAT

    by on September 11th, 2015

    Many integer properties questions on the GMAT involve the squares of integers, which are sometimes called “perfect squares.” In this video, we examine some important properties of the “perfect” squares. To help … Read More

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    Prime Numbers on the GMAT

    Prime Numbers on the GMAT

    by on September 10th, 2015

    The GMAT tests your knowledge of prime numbers in many different ways. In this two-video article, we’ll examine some important properties of prime numbers. To begin, let’s make sure you fully understand what prime … Read More

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    Solving Mixture Questions on the GMAT

    Solving Mixture Questions on the GMAT

    by on September 4th, 2015

    Learn a useful strategy for solving a wide range of mixture questions on the GMAT. Once you’ve watched the video, use the technique to answer the following practice questions: Practice question #1 Practice question #2 Read More

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    Variables in the Answer Choices—Part III: Tips for the Input-Output Approach

    Variables in the Answer Choices—Part III: Tips for the Input-Output Approach

    by on September 3rd, 2015

    In the last two articles (click here to see Part I and Part II), we examined two strategies for answering questions with variables in the answer choices: Algebraic approach Input-output approach In this video, we examine … Read More

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    Variables in the Answer Choices—Part II: Tips for the Algebraic Approach

    Variables in the Answer Choices—Part II: Tips for the Algebraic Approach

    by on September 2nd, 2015

    In the last article, we examined two popular strategies for answering questions with variables in the answer choices: Algebraic approach Input-output approach In this video, we examine some useful tips to consider when … Read More

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    Variables in the Answer Choices—Part I

    Variables in the Answer Choices—Part I

    by on August 31st, 2015

    Most Problem Solving questions on the GMAT have numbers for the answer choices. This, however, isn’t always the case. A common question type on the GMAT features variables in the answer choices, and these questions … Read More

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    3-Criteria Overlapping Sets on the GMAT

    3-Criteria Overlapping Sets on the GMAT

    by on August 30th, 2015

    In this video, we examine how to solve questions involving populations in which each member of that population has three criteria associated with it. Once you’ve watched the lesson, try answering the following … Read More

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    Sums of Sequences (a.k.a. Series) on the GMAT

    Sums of Sequences (a.k.a. Series) on the GMAT

    by on August 29th, 2015

    Some GMAT questions ask us to find the sums of sequences. In this video lesson, we’ll examine two important concepts you need to know to answer these questions. Once you’ve watched the video lesson, try answering … Read More

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    Recursive Sequences on the GMAT

    Recursive Sequences on the GMAT

    by on August 27th, 2015

    GMAT questions involving recursive sequences are often difficult. In fact, some students have trouble getting past the strange notation. In this video, we examine the notation used to define recursive sequences and how … Read More

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    Introduction to Sequences on the GMAT

    Introduction to Sequences on the GMAT

    by on August 26th, 2015

    When it comes to sequence questions on the GMAT, many students like to apply formulas they learned in high school. The problem with this is that, when sequence questions are posed in nonstandard formats, these formulas … Read More

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    GMAT Motion Questions with Multiple Trips and/or Multiple Travelers

    GMAT Motion Questions with Multiple Trips and/or Multiple Travelers

    by on August 23rd, 2015

    In this video, we learn how to solve advanced motion questions in which we have multiple trips and/or multiple travelers. Read More

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