Estimation word problems with mixed operations | Khan Academy
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https://www.khanacademy.org/math/3rd-grade-illustrative-mathematics/x0d15758a763061cf:wrapping-up-addition-and-subtraction-within-1000/x0d15758a763061cf:does-it-make-sense/v/estimation-word-problems-with-mixed-operations
Sal uses estimation to find friendly numbers to help us add and subtract in word problems with mixed operations.
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