1.	Two new pennies weigh 3.15 grams and 3.128 grams, respectively. Find the difference of their weights.
		A.	0.023 g	B.	0.11 g
		C.	0.022 g	D.	0.22 g
		Hint
	2.	Find the difference.
		A.	21.8	B.	21
		C.	22.8	D.	22
		Hint
	3.	Find the difference of 4.3 and 0.52.
		A.	3.51	B.	3.78
		C.	3.68	D.	3.41
		Hint
	4.	Find the sum of 22.3 and 5.23.
		A.	74.6	B.	275.3
		C.	27.53	D.	7.46
		Hint
	5.	How much change should you receive if you give the cashier $30 for a purchase that costs $24.32?
		A.	$5.78	B.	$5.68
		C.	$6	D.	$6.78
		Hint