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Average

Add $n$ numbers and divide the result by $n$.

Associative Property of Multiplication

When three real numbers are multiplied, it makes no difference which two are multiplied first.

When three real numbers are added, it makes no difference which two are added first.

Algebraic inequality

An inequality that contains one or more variable terms.

The sum of a real number and its opposite is zero.

Two numbers whose sum is zero.

The sum of zero and a real number equals the number itself.

Add the same quantity to each side.

Add two integers with like signs

Add their absolute values and attach the common sign to the result.

Abundant number

A number where the sum of its proper factors is greater than the number.

Glossary: A