1.	Estimate 5.23 + 3.5 + 6.1 + 7.8 by rounding.
		A.	25	B.	21
		C.	23	D.	20
		Hint
	2.	Estimate 351.62 ÷ 4.9 by rounding.
		A.	90	B.	72
		C.	97	D.	70
		Hint
	3.	Estimate 196.37 - 75.64 - 112.88.
		A.	100	B.	7.85
		C.	20	D.	10
		Hint
	4.	Estimate 847.52 ÷ 10.89.
		A.	77.83	B.	90
		C.	77.09	D.	80
		Hint
	5.	Estimate 13.98 + 15.05 + 14.88 + 14.36 + 15.91 by clustering.
		A.	74.18	B.	75
		C.	60	D.	100
		Hint