9+7
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Whichever one changes the order of the addends. a + b = b + a
Commutative property.
you can not use commutative property for subtraction because if you switch them around you will end up with a negative number.
Distributive Property: distribute base number, Commutative Property: changing order doesn't change answer, Associative Property: changing gouping doesn't change answer, Identity Property of Addition: any number plus zero equals that number, Identity Property of Multiplication: any number multiplied by one equals that nuber, Zero Property: any number multiplied by zero equals zero
(A + B) + C = A + (B + C) = A + B + C