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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It is: 215 that rounds off to 220 to the nearest ten
6.5 to the nearest whole number is 7.
20.663 to nearest whole number is 21
It is 10 rounded to the nearest whole number
51.625 to the nearest whole number is 52