1) What is the estimate of this sum by rounding to nearest ten: 12 + 35 = a) 10 + 40 = 50 b) 20 + 30 = 50 c) 10 + 30 = 40 2) What is the estimate of this sum by rounding to nearest ten: 27 + 41 = a) 20 + 40 = 60 b) 30 + 40 = 70 c) 20 + 50 = 70 3) What is the estimate of this sum by rounding to nearest hundred: 134 + 467 = a) 100 + 400 = 500 b) 200 + 500 = 700 c) 100 + 500 = 600 4) What is the estimate of this sum by rounding to nearest hundred: 275 + 621 = a) 300 + 600 = 900 b) 200 + 700 = 900 c) 200 + 600 = 700 5) Estimate the difference by rounding to the nearest ten: 42 - 15 =  a) 50 - 20 = 30 b) 40 - 20 = 20 c) 40 - 10 = 30 6) Estimate the difference by rounding to the nearest ten: 57 - 23 = a) 60 - 30 = 30 b) 50 - 20 = 30 c) 60 - 20 = 40 7) Estimate the difference by rounding to the nearest hundred: 521 - 385 = a) 500 - 400 = 100 b) 600 - 300 = 300 c) 500 - 300 = 200 8) Estimate the difference by rounding to the nearest hundred: 796 - 213 = a) 800 - 300 = 500 b) 800 - 200 = 600 c) 700 - 200 = 500

Estimating Sums

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