Adding and subtracting 2-step word problems | 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/adding-and-subtracting-2-step-word-problems
Sal uses a tape diagram to help him solve a two step word problem involving addition and subtraction within 1,000.
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