Rounding whole number word problems | 3rd grade math (TX TEKS) | Khan Academy
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https://www.khanacademy.org/math/grade-3-tx-teks/x41fbdd6301d5fded:addition-and-subtraction/x41fbdd6301d5fded:rounding-to-the-nearest-10-or-100/v/rounding-whole-numbers-word-problems
Sal uses a number line to round whole numbers to the nearest ten and hundred.
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