3.0 is a whole number, it's equal to 3 (three)
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When rounding a number to the nearest whole number, you look at the digit immediately to the right of the decimal point. In this case, the number 30 is already a whole number, so it does not need to be rounded. Therefore, 30 rounded to the nearest whole number remains 30.
43 to the nearest whole number
30
30.
It is 30.