What is the estimate of this sum by rounding to nearest ten: 12 + 35 =, 10 + 40 = 50, 20 + 30 = 50, 10 + 30 = 40, What is the estimate of this sum by rounding to nearest ten: 27 + 41 =, 20 + 40 = 60, 30 + 40 = 70, 20 + 50 = 70, What is the estimate of this sum by rounding to nearest hundred: 134 + 467 =, 100 + 400 = 500, 200 + 500 = 700, 100 + 500 = 600, What is the estimate of this sum by rounding to nearest hundred: 275 + 621 =, 300 + 600 = 900, 200 + 700 = 900, 200 + 600 = 700, Estimate the difference by rounding to the nearest ten: 42 - 15 =, 50 - 20 = 30, 40 - 20 = 20, 40 - 10 = 30, Estimate the difference by rounding to the nearest ten: 57 - 23 =, 60 - 30 = 30, 50 - 20 = 30, 60 - 20 = 40, Estimate the difference by rounding to the nearest hundred: 521 - 385 =, 500 - 400 = 100, 600 - 300 = 300, 500 - 300 = 200, Estimate the difference by rounding to the nearest hundred: 796 - 213 =, 800 - 300 = 500, 800 - 200 = 600, 700 - 200 = 500

Estimating Sums

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