#### Average

#### Associative Property of Multiplication

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

#### Associative Property of Addition

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

#### Area formula

A formula used to find the area of geometric objects or figures. Area is measured in square units.

#### Approximately equal to

The symbol $\,\approx\,$ represents an answer that is rounded to a specified number of decimal places.

#### Alternative rule for subtracting two fractions

If $a$, $b$, $c$, and $d$ are integers with $b\ne 0$ and $d\ne 0$, then $\,\displaystyle{a\over b}-{c\over d}={{ad-bc}\over{bd}}$.

#### Alternative rule for adding two fractions

If $a$, $b$, $c$, and $d$ are integers with $b\ne 0$ and $d\ne 0$, then $\,\displaystyle{a\over b}+{c\over d}={{ad+bc}\over{bd}}$.

#### Algebraic inequality

An inequality that contains one or more variable terms.

#### Algebraic expression

A collection of variables and constants combined by using addition, subtraction, multiplication, or division.

#### Algebraic equation

Uses an equal sign to set two algebraic expressions equal to each other and is true for only certain values of the variable.