Summary GRE Math Formulas rated A

GRE Math Formulas rated A
Integers - Any counting numbers (whole numbers), including negatives (e.g., -3, -1,
2, 7... but not 2.5)



Real Numbers - All numbers (including fractions, decimals, square roots,
negatives, and even π), except for imaginary ones



PEMDAS - Parentheses, Exponents, Multiplication/Division, Addition/Subtraction;
order of operations



Commutative Property - a+b = b+a , a x b = b x a



Associative Property - (a + b) + c = a + (b + c) ,

(a x b) x c = a x (b x c)



Distributive Property - a(b + c) = ab + ac ,

a(b-c) = ab - bc



All Prime Numbers below 60 (17) - 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43,
47, 53, 59

, GRE Math Formulas rated A
Divisibility Rules for 3 - sum of digits divisible by 3



Divisibility Rules for 4 - the last two digits of number are divisible by 4



Divisibility Rules for 5 - the last digit is either a 5 or zero



Divisibility Rules for 6 - even number and sum of digits is divisible by 3



Divisibility Rules for 8 - f the last three digits are divisible by 8



Divisibility Rules for 9 - sum of digits is divisible by 9



Fast Fractions - 1/x + 1/y = (x+y) / xy;

1/2 + 1/5 = (2+5) / (2x5) = 7/10



Absolute Values - The absolute value of a number is its distance from a number
line; |x| = x, |-x| = x



Ratio - x : y, x to y, or x / y