Estimating Sums

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Examples, solutions, and videos to teach Grade 3 students how to estimate sums by rounding and by compatible numbers.

Rounding to Estimate Sums

Estimate Sums
How to estimate sums, by using “Compatible” numbers, and by Rounding?

Estimating Addition and Subtraction Problems
This video explains how to round whole numbers to estimate addition and subtraction problems.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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