Performing mental math calculations faster and more accurately is a surprisingly important element of success on the GMAT. And for any given ability level, It’s also important to gain confidence in your mental math abilities before taking the GMAT. Confidence is often half the battle. At the same time, practicing, having strategies in your mind, and understanding where and how mental math is important can all breed confidence.

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## How to Approach GMAT Combinatorics: Key Principles

Posted by Morgan Bissett-Tessier on Tue, Feb 09, 2021 @ 01:19 PM

#### Combinatorics is the art of counting. You’ll need to understand this art to do well on the GMAT.

It is common for GMAT students looking for a 700+ score to have many questions about GMAT combinatorics problems. These are the GMAT questions that ask you to count up all the possible arrangements of individuals and groups in a variety of situations: How many ways can 5 men and 5 women be ordered in a line? How many high fives occur in a group of 15 people on a basketball team? GMAT tutors often find themselves spending an inordinate amount of time helping students improve their ability to answer these types of GMAT questions.

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## 2018 Official Guide to the GMAT Review Series: Problem #23 (Algebra Distance-Rate Problems)

Posted by John Easter on Fri, Aug 31, 2018 @ 02:43 PM

This post is the fourth in our series on using strategies to answer specific questions from the 2018 Official Guide. Here, one of our most experienced GMAT tutors, John Easter, analyzes a question about distance-rate.

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## 2018 Official Guide to the GMAT Review Series: Problem #17 (Direct Calculation)

Posted by John Easter on Wed, Aug 29, 2018 @ 02:42 PM

This post is the third in our series on using strategies to answer specific questions from the 2018 Official Guide. Here, one of our most experienced GMAT tutors, John Easter, analyzes a question about direct calculation.

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## 2018 Official Guide to the GMAT Review Series: Problem #44 (Problem Solving - Prime numbers)

Posted by John Easter on Mon, Jul 23, 2018 @ 09:55 AM

Problem #44 of the 2018 Official Guide to the GMAT states that if n is a prime number greater than 3, what is the remainder when n^2 is divided by 12?

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## 2018 Official Guide to the GMAT Review Series: Problem #167 (Back solving Variable in Choices)

Posted by John Easter on Mon, Jul 16, 2018 @ 10:25 AM

in this series, one of our most experienced GMAT tutors, John Easter, applies useful strategies to answer questions from the 2018 Official Guide.

Problem #167 of the 2018 Official Guide to the GMAT states that four extra-large sandwiches of exactly the same size were ordered for m students where m>4. Three of the sandwiches were evenly divided among the students. Since 4 students did not want any of the fourth sandwich, it was evenly divided among the remaining students. If Carol ate one piece from each of the four sandwiches, the amount of sandwich that she ate would be what fraction of a whole extra-large sandwich?

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