To round 18.25 to the nearest whole number, follow these steps:
Identify the decimal part: In the number 18.25, the first digit after the decimal point is 2.
Apply rounding rules: Since the first digit after the decimal point (2) is less than 5, you keep the number unchanged.
Final rounded result: The number remains the same 18.
Thus, 18.25 rounded to the nearest whole number is 18.