1.	Find the product 4 · 6 · 5 mentally.
		A.	80	B.	100
		C.	120	D.	20
		Hint
	2.	Simplify 6 + b + 3.
		A.	3 + b	B.	9
		C.	b + 9	D.	9b
		Hint
	3.	Name the property shown by the statement a + b + 0 = 0 + a + b.
		A.	Commutative Property of Addition
		B.	Additive Identity
		C.	None of these
		D.	Associative Property of Addition
		Hint
	4.	Simplify (r + 6) + 27.
		A.	r + 21	B.	33r
		C.	6r + 27	D.	r + 33
		Hint
	5.	Which is not a valid property?
		A.	Associative Property of Addition
		B.	Associative Property of Subtraction
		C.	All of these are valid.
		D.	Associative Property of Multiplication
		Hint