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.
1.523 rounded to the nearest whole number is 2
It is 10 rounded to the nearest whole number
20.663 to nearest whole number is 21