1.	Solve 9 + __ = 13.
		A.	22	B.	6
		C.	5	D.	4
		Hint
	2.	Solve __ + 8 = 10.
		A.	18	B.	2
		C.	8	D.	4
		Hint
	3.	Solve __ − 3 = 12.
		A.	12	B.	6
		C.	15	D.	9
		Hint
	4.	What rule or property is illustrated by 8 + 2 = 2 + 8?
		A.	Commutative Property of Addition	B.	Identity Property of Addition
		C.	Associative Property of Addition	D.	Subtraction Rule
		Hint
	5.	Find 15 − 6 + 7.
		A.	9	B.	17
		C.	16	D.	28
		Hint