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.
1.523 rounded to the nearest whole number is 2
20.663 to nearest whole number is 21
51.625 to the nearest whole number is 52