More Lessons for Grade 3 Math
Examples, solutions, and videos to teach Grade 3 students how to round whole numbers to estimate addition and subtraction problems.
Estimating whole numbers
Estimate a sum or difference
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 to get 8,000.
Estimating Addition and Subtraction Problems Involving Whole Numbers
This video explains how to round whole numbers to estimate addition and subtraction problems.
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