1.	Round to the nearest ten. Estimate the sum.
		A.	40	B.	60
		C.	50	D.	30
		Hint
	2.	Round to the nearest ten. Estimate the sum.
		A.	70	B.	40
		C.	60	D.	50
		Hint
	3.	Round to the nearest ten. Estimate the sum.
		A.	70	B.	50
		C.	60	D.	40
		Hint
	4.	Round to the nearest ten. Estimate the sum.
		A.	70	B.	50
		C.	80	D.	60
		Hint
	5.	Round to the nearest ten. Estimate the sum.
		A.	60	B.	50
		C.	70	D.	40
		Hint