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# GRE Math

### basic math concepts

recognize multiples of 3 sum of digits is a multiple of 3
recognize multiples of 4 sum of digits are a multiple of 4
recognize multiples of 6 sum of digits is a multiple of 3 and last digit is even
recognize multiples of 9 sum of digits is a multiple of 9
recognize multiples of 12 sum of digits is a multiple of 3 and last two digits are a multiple of 4
prime number A prime number can be divided, without a remainder, only by itself and by 1. Examples: 2,3,5,7,11,13,17,etc...(note: 1 and 0 are not considered prime numbers)
composite number A composite number is defined as any number, greater than 1, that is not prime.
how to find the least common multiple To find the least common multiple divide both numbers by the common factors that they share.
how to find percent change % change=(amount changed/original whole)*100
probability probability= number of favorable outcomes/total number of possible outcomes
Simplify polynomials ex. ((3x^2)+5x)(x-1) ((3x^2)+5x)(x-1)= (3x^2)(x-1)+5x(x-1)= (3x^3)-(3x^2)+(5x^2)-5x= (3x^3)+(2x^2)-5x=
How to factor the following polynomials: ab+ac (a^2)+2ab+(b^2) (a^2)-2ab+(b^2) (a^2)-(b^2) ab+ac=a(b+c) (a^2)+2ab+(b^2)=(a+b)^2 (a^2)-2ab+(b^2)=(a-b)^2 (a^2)-(b^2)=(a-b)(a+b)
When solving for an inequality, when do you flip the sign? Multiplication or division by a negative number reverses the sign of the inequality
Created by: monilc