80 is a whole number.
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When rounding 80 to the nearest whole number, you look at the digit in the ones place, which is 0. Since 0 is less than 5, you round down, making 80 rounded to the nearest whole number 80.
Yes, it is.
Whole numbers means no decimal places have to be represented and no fractions can be associated with it. so 80 is a whole number and the whole number before it is 79 and the whole number after it is 81
82
No, because an integer is a whole number and it's opposite (negative or positive). The square root of 80 is not a whole number.