What is 654.874 rounded to the nearest whole number?

Answer 1

To the nearest whole number is to the nearest unit which is the digit before the decimal point. The digit to its right (the one after the decimal point) is used to decide whether to round up or down: if it is 0-4 it rounds down, otherwise it is 5-9 and rounds up:

With 654.874 the digit to the right of the units digit is 8, so it rounds up: 654.874 → 655