 # Estimating Numbers

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More Lessons for Grade 3 Math
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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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You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations. 