PRE-ALGEBRA
Lesson 6 of 171

ADDITION AND SUBTRACTION
Estimating Sums and Differences
Students learn to estimate a sum or difference by first rounding each number to the place specified in the problem. For example, to estimate 4,909 + 3,217 by rounding each number to the nearest thousand, first round 4,909 up to 5,000, and round 3,217 down to 3,000, then add 5,000 + 3,000  more...
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