
	1.	Estimate. Round to the tens.
		A.	30 + 20 = 50	B.	50 + 20 = 70
		C.	30 + 10 = 40	D.	20 + 10 = 30
		Hint

	2.	Estimate. Round to the tens. $54 + $21
		A.	$50 + $30 = $80	B.	$60 + $30 = $90
		C.	$50 + $20 = $70	D.	$75 + $25 = $100
		Hint

	3.	Solve.
		A.	71	B.	81
		C.	82	D.	17
		Hint

	4.	Solve.
		A.	39	B.	105
		C.	85	D.	95
		Hint

	5.	Solve.
		A.	50	B.	34
		C.	33	D.	35
		Hint