To round the number 113.04 to the nearest whole number, we need to look at the digit in the tenths place, which is the first digit to the right of the decimal point.
In the case of 113.04, the digit in the tenths place is 0. According to rounding rules, if this digit is less than 5, we round down. Since 0 is less than 5, we round 113.04 down to 113.
Therefore, 113.04 rounded to the nearest whole number is 113.