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Estimations

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Describe the method used to estimate the sum, difference, product, or quotient. Then describe a better method and revise the estimate.

1) 362 - 118 ≈ 400 - 100 = 300

2) 19 x 2 ≈ 20 x 0 = 0

3) 148 + 138 ≈ 100 + 100 = 200

4) 305 ÷ 16 ≈ 300 ÷ 20 = 15

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