1.	What number is approximately 40% of 685?
		A.	350	B.	320
		C.	280	D.	420
		Hint
	2.	Find 50% of 80 mentally.
		A.	20	B.	40
		C.	160	D.	4
		Hint
	3.	Find 25% of 20 mentally.
		A.	5	B.	80
		C.	4	D.	10
		Hint
	4.	Find 60% of 30 mentally.
		A.	18	B.	12
		C.	50	D.	24
		Hint
	5.	Estimate 73% of 16.
		A.	12	B.	8
		C.	14	D.	10
		Hint