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並前往https://www.khanacademy.org/math/arithmetic-home/arith-place-value/arith-rounding/v/rounding-to-the-nearest-10

Rounding to nearest 10 (video) - Khan Academy

Learn to use a number line to round 2-digit numbers to the nearest ten. ... Or 30 dosn't round up or down, it rounds to 30, also 20 rounds to 20. Comment

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