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https://www.khanacademy.org/math/grade-3-tx-teks/x41fbdd6301d5fded:addition-and-subtraction/x41fbdd6301d5fded:understanding-relative-size/v/finding-consecutive-multiples-1000-and-10000

Sal uses a number line to determine which of three points is closest to a given number. By using rounding, Sal finds the nearest consecutive multiple to the nearest 10,000.

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