1.	Estimate the difference to the nearest ten. 523 − 491
		A.	40	B.	50
		C.	20	D.	30
		Hint
	2.	Estimate the difference to the nearest ten. 769 − 335
		A.	440	B.	420
		C.	430	D.	450
		Hint
	3.	Estimate the difference to the nearest hundred. 523 − 491
		A.	0	B.	80
		C.	90	D.	100
		Hint
	4.	Estimate the difference to the nearest hundred. 298 − 108
		A.	400	B.	90
		C.	200	D.	100
		Hint
	5.	Estimate the difference to the nearest hundred. 769 − 335
		A.	500	B.	300
		C.	400	D.	600
		Hint