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# Math Topic 2

### Variables, Expressions, and Properties

TermDefinition
Evaluate To find the value of an expression
Identity Property of Addition Adding zero to a number does not change the number
Identity Property of Multiplication The product of a number and one is that number
Associative Property of Multiplication The way numbers are grouped doe not affect the product
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 subtraction) the products
Order of Operations Set of rules mathematicians use to determine the order in which operations are performed
Substitution To replace a variable with a number
Commutative Property of Multipication the ordering which numbers are multiplied does not change the product of numbers
Variable A quantity that can change at vary, often represented with a letter
Commutative Property of Addition The order in which numbers are added does not change the sum of the numbers
Coefficient The number that is multiplied by a variable in a algebraic expression Ex: for 6x + 5, the coefficient is 6
Associative property of Addition The way numbers are grouped does not affect the sum
Algebraic expression A mathematical phrase that has a least one variable and one operation