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# Math Topic 2

### Variables, Expressions, and Properties

TermDefinition
Algebraic Expression A mathematical phrase that has at least one variable and one operation
Associative Property of Addition The way numbers are grouped does not affect the sum
Variable A quantity that can change or vary, often represented with a letter
Input / output table A table of related values
Coefficient The number that is multiplied by a variable in an algebraic expression Example: for 6x + 5, the coefficient is 6.
Commutative Property of Addition The order in which numbers are added does not change the sum of the numbers
Commutative Property of multiplication The order in which numbers are multiplied does not change the product of the numbers.
Substitution To replace a variable with a number
Identity Property of multiplication The product of a number and one is that number
Associative Property of multiplication The way numbers are grouped does not affect the product
Order of operation A set of rules mathematicians use to determine the order in which operations are preformed
Distributive property Multiplying a sum (or difference) by a number gives the same results as multiplying each number in the sum (or difference) by the number and adding (or subtracting) the products
Identity property of addition Adding zero to a number does not change the number
Evaluate To find the value of an expression