reciprocal {Ans: the resulting fraction when you switch the numerator and denominator}sum {Ans: the answer to an addition problem}integer {Ans: any positive whole number, negative whole number, or zero. Integers may not contain fractions or decimals}prime numbers {Ans: a number which can only be divided by itself and 1. The first few prime numbers are 2, 3, 5. 7, 11, 13, 17, 19, 23, 29}factor {Ans: a number that is multiplied by another number}divisor {Ans: the number that divides into another number}