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When rounding, when you add a 1 to 9 the answer is 10.The 0 is put in the place you are rounding to and the 1 is added to the digit to the left of it.

For example,

20.96 rounded to the nearest tenth is 21.0

107.899 rounded to the nearest hundredth is 107.90

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Q: Why do 9's round to the next whole number in a calculator?
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