The number 47.25 rounds to 47 as a whole number. When rounding a decimal number to a whole number, you look at the digit immediately to the right of the decimal point. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, the digit to the right of the decimal point is 2, which is less than 5, so 47.25 rounds down to 47 as a whole number.
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If a number is already a whole number, and you are being asked to round it to the nearest whole number, then you don't need to round it anymore, since itself is the nearest whole number.
How do u round 57.3 to the nearest whole number
round this number 75.9913
15 is the nearest whole number
178 is, itself, a whole number.