Strategies, Sample Questions, and Random Ramblings.
July 16, 2015
GMAT number properties is just a fancy way to describe the way numbers work in relationship to each other. This is an interesting topic on the GMAT because despite the fact that the fundamental knowledge in this section is easy to learn, these questions tend to give people major headaches. It is all about thinking outside of the box when looking at a question.
Do not make the foolish assumption that this stuff is so easy that you do not need to spend time reviewing this material. Even though the disciplines are simple at their core, a deep understanding will aid you in making the difficult problems simple. Even concepts like positive and negative numbers or even and odd numbers can give people fits on this exam if they do not have a comfortable grasp of each aspect of these disciplines.
Here are a few definitions and tips that are important going forward:
Integer: A positive or negative whole number, including 0.
*If the problem does not specify that variables in the question are integers, do not assume that they are integers.
Zero: It is an even integer.
Perfect Square: A number that is the product of an integer and itself (otherwise known as the square of an integer). Example: 1, 4, 9, 16, etc.
Prime numbers are the building blocks of numbers. In general, most people have a firm grasp of what a prime number is, but the test writers have some tricky ways to test your ability to understand the subject. Take a look at our GMAT prime numbers guide.
After covering the building blocks, we now need to actually start putting the blocks together. Factors and Multiples are so prevalent on this test that you absolutely must spend time here and perfect these methods. You will undoubtedly see at least 3 questions on the exam specifically related to this topic and handfuls more where GMAT Factors and Multiples will contribute to the solution.
Honestly, consecutive numbers are not a huge topic on the GMAT; however, learning just a few quick rules can save a minute or two come test day. While it may not seem like a lot, 2 minutes could mean the difference of getting a question right at the end and you achieving your goals.
Yes, you know what even and odd numbers are. However, the pesky test writers have a way of making even a basic concept seem difficult.
The description above pretty much fits true here as well. Positive and negative numbers are as simple a concept as there is, but even the most basic of disciplines can have a few twists.
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