For many students, GMAT number properties is one of the most daunting sections of the exam. But it doesn’t have to be that way. The GMAT number properties section is just like any other difficult section during a standardized test:it can be mastered. The key to mastering a standardized test is knowing how to take one. Remember the SAT or ACT back in High School? Learning how to the take those exams was crucial to a high score. Fortunately, those rules that you learned for those examinations still apply. Therefore, being prepared for the GMAT number properties portion is all about understanding and reviewing very basic math concepts in order to save time. Below is a review of very basic mathematical definitions:
Integers are numbers sans a fractional part such as 3, 2, 1. A number like 2.25, which is a decimal, is not an integer. Integers can also be negative, such as -3,-2,-1 but do not have a fractional part as well. Positive integers are defined as being whole numbers. The 0 is also an integer but is considered to be positive or negative.
Factors are considered to be numbers that divides equally into another number. For example the number 3 is a factor of 12 because 12/4=3. It is also a factor of 6 because 6/2=3 or 9 because 9/3=3.
Prime numbers are whole numbers that only have two divisors, the actual number itself and one. For example, the number 7 is a prime number because its only two divisors are 7 and 1.
Greatest Common Factor
The Greatest Common Factor or GCF for short is the largest number that divides two numbers evenly. In order to determine the Greatest Common Factor is by setting up a prime factorization of two numbers and comparing common factors. The largest common factor between the two numbers is the GCF.
Least Common Multiple
To find the least common multiple, you perform a prime factorization in the same manner as one would do for the GCF. However, the least common multiple is the smallest number of a multiple of two numbers.
Unit digits are the number to the right of the tens position. For example, the units digit for the number 364 is 4.
After reviewing basic topics such as the ones previously described, creating a study schedule with practice questions is a good way to see where your strengths and weaknesses are. Once, you know where your weaknesses are, study accordingly.