One of two equal factors of a number. If a squared equals b then a is the square root of b. The square root of 144 is 12 because 12 squared is 144.

Irrational NumberNumbers that cannot be expressed as a/b.

Real Number

Irrational numbers together with rational numbers to form the set of all numbers.

Natural Numbers•1, 2, 3, 4...

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

The whole numbers and their opposites.

...-3, -2, -1, 0, 1, 2, 3...

Any number that can be expressed in the form a/b where a and b are integers and b is not equal to 0.

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