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numerical expression

A mathematical phrase involving numbers and operation symbols, but no variables.

algebraic expression

A mathematical phrase with one or more variables

Equation

A mathematical sentence that contains an equals sign.

Associative property of addition

Changing the grouping of add ends does not change the sum.

Associative Property of Multiplication

Changing the order of factors does not change the product

Addition Property of Equality

Says that if you add the same value to both sides of an equation, the equation remains balance.

Solution

The value of the equation that makes the equation true.

evaluate

To find the value of

Variable

a letter that represents a number

inverse operations

operations that undo each other.