0.45 should be rounded down to 0.
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To the nearest whole number, that rounds down to 5.
In this case, you would round DOWN to 91.
To round 27.47 to the nearest whole number, we look at the digit in the tenths place, which is 4. Since 4 is less than 5, we round down. Therefore, 27.47 rounded to the nearest whole number is 27.
As the last digit is a 2, it will round down giving 64 as the answer.
When rounding 25.1 to the nearest whole number, you look at the tenths place, which is 1 in this case. Since 1 is less than 5, you round down. Therefore, 25.1 rounded to the nearest whole number is 25.