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Unit 2

Expressions and Equations - 7th Grade Math

Algebraic Expression a symbol or a combination of symbols used in algebra, containing one or more numbers, variables, and arithmetic operations
Coefficient A number multiplied by a variable in an algebraic expression. Located in front of the variable in the form of multiplication
Constant A fixed value. Does not change.
Equation Contains an equal sign (=); A mathematical sentence that shows that two expressions are equivalent.
Inequality A statement that compares two quantities using <, >, ≤,≥, or ≠; A mathematical sentence indicating that two quantities are not equal.
Term a term is either a single number or variable, or numbers and variables multiplied together; Terms are separated by + or − signs
Numerical Expression An expression that contains only numbers and operations
Variable A letter or symbol used to represent an unknown value in math; A symbol used to represent a quantity that can change
Distributive Property The sum of two addends multiplied by a number is the sum of the product of each addend and the number. Example: a(b+c)= ab + ac