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並前往https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/estimate-to-add-multi-digit-numbers/v/estimating-adding-large-numbers-by-rounding

Estimating when adding multi-digit numbers (video) - Khan ...

Use estimation to find reasonable solutions to 2- and 3-digit addition problems.

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