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# Unit 4

### Properties & Expressions

TermDefinition
Commutative Properties If you change the order of the numbers, you will still get the same answer when you add or multiply.
Associative Properties Grouping the numbers differently will NOT change the answer when you add or multiply.
Identity Properties The value of a number does not change when you add zero or multiply by one.
Inverse Properties When you add the opposite or multiply by the reciprocal of a number.
Multiplicative Property of Zero When you multiply by zero the answer is zero.
Distributive Property Tells us how to solve expressions like a(b + c)
Multiplicative Inverse Another name for reciprocal. What you multiply by to get 1.
Additive Inverse Another name for opposite. What you add to a number to get zero.
Multiplicative Identity Element Another word for one.
Additive Identity Element Another word for zero.
Expression A math sentence that may contain variables, numbers, and operations.
Equation A math sentence that must contain an equal sign.
Order of Operations The rules that how to solve an expression in the correct order.
Evaluate When you calculate the value. Another word for solve.
Variable A symbol for a number we don't know yet.
Term A single number or variable or numbers and variables multiplied together.
Coefficient A number used to multiply a variable.
Created by: PRO Teacher scash