1.	Find 50% of 80 mentally.
		A.	20	B.	160
		C.	40	D.	4
		Hint
	2.	Find 25% of 20 mentally.
		A.	5	B.	4
		C.	10	D.	80
		Hint
	3.	Estimate 60% of 92.
		A.	48	B.	42
		C.	60	D.	54
		Hint
	4.	Find 75% of 24 mentally.
		A.	22	B.	18
		C.	12	D.	32
		Hint
	5.	Estimate 11% of 60.
		A.	3	B.	6
		C.	600	D.	10
		Hint