1.	Round each number to the nearest ten. Estimate the difference.
		A.	10	B.	40
		C.	20	D.	30
		Hint
	2.	Round each number to the nearest ten. Estimate the difference.
		A.	10	B.	30
		C.	20	D.	40
		Hint
	3.	Round each number to the nearest ten. Estimate the difference.
		A.	10	B.	20
		C.	40	D.	30
		Hint
	4.	Round each number to the nearest ten. Estimate the difference.
		A.	40	B.	10
		C.	30	D.	20
		Hint
	5.	Round each number to the nearest ten. Estimate the difference.
		A.	40	B.	30
		C.	20	D.	10
		Hint