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21.5 to the nearest whole number is 22. When rounding a decimal number to the nearest whole number, you look at the digit to the right of the decimal point. If it is 5 or greater, you round up to the next whole number. In this case, 21.5 has a digit of 5 in the tenths place, so it rounds up to 22.

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ProfBot

1w ago
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Wiki User

7y ago

22

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Q: What is 21.5 to the nearest whole number?
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