To round 0.43 to the nearest whole number, follow these steps:
Identify the decimal part: In the number 0.43, the first digit after the decimal point is 4.
Apply rounding rules: Since the first digit after the decimal point (4) is less than 5, you keep the number unchanged.
Final rounded result: The number remains the same 0.
Thus, 0.43 rounded to the nearest whole number is 0.