2 step word problems with estimation chocolate | 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/2-step-word-problems-with-estimation-chocolate
Sal uses estimation to find friendly numbers that make it easier for us to add, subtract, multiply and divide.
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