1.	Estimate 25.412 - 6.93 by rounding.
		A.	17	B.	19
		C.	20	D.	18
		Hint
	2.	Estimate 23.9 × 32.5 by rounding.
		A.	1,200	B.	600
		C.	900	D.	800
		Hint
	3.	Estimate 5.23 + 3.5 + 6.1 + 7.8 by rounding.
		A.	25	B.	23
		C.	21	D.	20
		Hint
	4.	Estimate 196.37 - 75.64 - 112.88.
		A.	7.85	B.	20
		C.	10	D.	100
		Hint
	5.	Estimate 847.52 ÷ 10.89.
		A.	77.09	B.	77.83
		C.	90	D.	80
		Hint