it is 3
look at the first number after the decimal point. If less than 5 then it rounds down (to 3 in this case). If 5 or greater it rounds up to 4
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345 is a whole number already so just write that.
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