Numerical Expression-involves numbers and operations

Variable Expression- involves numbers, letters, and operations

Variable- a letter used to represent an unknown number

Evaluate- to solve an expression

Order of Operations-the process of solving a math problem that involves more than one operation.

Integer-any whole number, does not include fractions.

Reciprocal-to take a fraction and “flip it” upside down. Ex) 5/1 the reciprocal is 1/5.

Opposite- a number that is the exact distance from zero on the other side of a number line. Ex) 5 the opposite is -5


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