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Answered 2014-06-19 14:03:15

The answer to an addition question should have no more decimal places than the smallest number of decimal places in the numbers being added. When rounding numbers, numbers 5 though 9 will be rounded up and 1 through 4 will be rounded down.

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What are the rules for rounding decimals?

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21.7486, but this depends on the rounding rules. Math has different rules that science. I rounded with science rules. Usually rounding to the thousandth would be the third decimal place, making it 21.749

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There are no set rules about rounding numbers, so when rounding numbers, mathematical rules about rounding can be used. For example, 14 would be rounded to 10, but 15 would be rounded to 20. For another example, 1144 is rounded to 1140 and 1145 is rounded to 1150.

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See related link below for a good explanation

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