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Natural Numbers

1, 2, 3, 4, 5, ...

Whole Numbers

0, 1, 2, 3, 4, 5, ...

Integers

...-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, ...

Rational Numbers

Any number that can be expressed as the ratio of two integers, written in the form a/b where a and b are integers, b cannot equal 0. A repeating decimal or a terminating decimal.

Irrational Numbers

A number that cannot be expressed as the ratio of two integers. Non-repeating, non-terminating decimal.