Key Idea1 of 3
Estimate Before You Calculate
Round each number first, then add or subtract. 48 + 73 → 50 + 70 = 120. The exact answer is 121, so 120 is a good estimate.
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Mathematics — Rounding and Estimating
Round each number first, then add or subtract. 48 + 73 → 50 + 70 = 120. The exact answer is 121, so 120 is a good estimate.