1.	Tell which equation is an estimate for
		A.	50 × 10 = 500	B.	50 + 10 = 60
		C.	50 × 20 = 1,000	D.	60 × 10 = 600
		Hint
	2.	Tell which equation is an estimate for
		A.	420 + 10 = 430	B.	400 × 10 = 4,000
		C.	500 × 10 = 5,000	D.	400 × 5 = 2,000
		Hint
	3.	Tell which equation is an estimate for
		A.	200 × 40 = 8,000	B.	300 × 50 = 15,000
		C.	300 × 40 = 12,000	D.	260 + 50 = 310
		Hint
	4.	Estimate196 × 31.
		A.	200 × 30 = 6,000	B.	200 + 30 = 230
		C.	100 × 30 = 3,000	D.	200 × 40 = 8,000
		Hint
	5.	An athlete exercises for 78 minutes every day. Tell which equation can be used to estimate how long the athlete exercises in one week.
		A.	80 + 7 = 87	B.	70 × 10 = 700
		C.	80 × 7 = 560	D.	100 ×7 = 700
		Hint