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# math topic 2

### Variables,Expressions,andProperties

TermDefinition
order of operations a set of rules mathematicians use to determine the order in which operations are performed
identity property of addition adding zero to a number dose not change the number
associative property of multiplication the way numbers are grouped dose not affect the product
identity property of multiplication the product of a number and one is that number
evaluate to find the value of an expression
input/output table a table of related values
distributive property multiplying a sum (or difference) by a number gives the same result as multiplying each number in the sum (or difference by the number and adding (or subtracting) the products
commutative property of addition the order in which number are added dose not change the sum of the numbers
algebraic expression a mathematical phrase that has at least one variable and one operation
commutative property of multiplication the order in which numbers are multiplied dose not change the product of the numbers
variable a quantity that can change or vary, often repressed with a letter
coefficient the number that is multiplied by a variable in an algebraic expression.
substitution to replace a variable with a number
associative property of addition the way numbers are grouped dose not affect the sum