| A | B |
|---|
| Prime Number | A whole number greater than one with exactly two factors, itself and one. |
| Relatively Prime | Two composite numbers with no common factors other than one. |
| Twin Primes | A pair of primes with a difference of two. |
| Composite Number | A number with more than two factors. |
| Prime Factorization | Every composite number can be expressed as a product of prime numbers |
| Greatest Common Factor | The greatest of factors common to two or more numbers. |
| Least Common Multiple | The least of the nonzero common multiples of two or more numbers. (Key word is 'multiple'.) |
| Natural Numbers | The set of numbers {1, 2, 3, ..., n} |
| Whole Numbers | The set of numbers {0, 1, 2, 3, ..., n} |
| Integers | The set of numbers {-n, ..., -2, -1, 0, 1, 2, ..., n} |
| Rational Numbers | Numbers that can be expressed as terminating or repeating decimals. |
| Irrational Numbers | Numbers that go on forever. |
| Real Numbers | All possible numbers other than imaginary. |
