82
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80 is a whole number.
There is no greatest whole number. If x were the greatest whole number then what about x+1? It would be greater than x and it would be a whole number!
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