
	1.	Find the number that completes the number sentence. Then identify the property or rule. 12 − ∅ = 12
		A.	0; Commutative Property of Addition
		B.	0; Subtraction Rule
		C.	0; Associative Property of Addition
		D.	43; Identity Property of Addition
		Hint

	2.	Find the number that completes the number sentence. Then identify the property or rule. 24 + ∅ = 18 + 24
		A.	0; Identity Property of Addition
		B.	6; Subtraction Rule
		C.	18; Associative Property of Addition
		D.	18; Commutative Property of Addition
		Hint

	3.	Find the number that completes the number sentence. Then identify the property or rule. (21 + 13) + 56 = 21 + (∅ + 56)
		A.	13; Commutative Property of Addition
		B.	21; Identity Property of Addition
		C.	35; Subtraction Rule
		D.	13; Associative Property of Addition
		Hint

	4.	Find the number that completes the number sentence. Then identify the property or rule. 43 + ∅ = 43
		A.	0; Commutative Property of Addition
		B.	0; Associative Property of Addition
		C.	0; Identity Property of Addition
		D.	12; Subtraction Rule
		Hint

	5.	Add mentally. 18 + 41 + 12
		A.	82	B.	81
		C.	71	D.	61
		Hint