# Middle School Math Resources

#### for Teachers, Parents and Students

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 Math Vocabulary A   Absolute Value The distance between a number and 0 on a number line. Absolute value bars are usually represented with |x|. Acute Angle An angle whose measure is less than 90 degrees. Acute Triangle A triangle whose angles all measure less than 90 degrees. Addition Property of Inequality For all numbers "a", "b", and "c", if a > b, then a + c > b + c and if a Addition Property of Equality Adding the same number to each side of an equation produces an equivalent equation. If a = b, then a + c = b + c. Additive Identity Property For any number "a" , a + 0 = 0 + a = a Additive Inverse Property For any number "a", a + (-a) = 0   Adjacent Next to. Algebraic Expression An expression that includes one or more numbers and variables along with at least one arithmetic operation. Algebraic Model An algebraic expression or equation used to represent a real-life situation.   Algorithm A step-by-step method for computing. Angle A figure formed by two rays that begin at the same point. Area A measure of how much surface is covered by a figure. Associative Property For any numbers "a", "b", and "c", (a + b) + c = a + (b + c) and (ab)c = a(bc) Average The sum of a set of numbers divided by how many numbers are in the set. Also called the mean. Axes Two perpendicular number lines used to locate points on a coordinate plane