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To round to the nearest hundred, look at the tens digit - if it is 4 or less, round down otherwise it is 5 or more and so round up:

In 648, the tens digit is 4 (which is 4 or less) so round down to 600.

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βˆ™ 2010-09-26 20:44:16
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Q: Does 648 round down or round up to the nearest hundred?
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