Quite simply because you NEED fractions. Fractions exist everywhere whether you chose to acknowledge them or not.
You round to the nearest whole number.
work out
To the nearest whole number, that rounds down to 5.
Any number of 18.5 and greater will round off to 19
You cannot round a whole number like 2298 to the nearest tenth because tenths are used to round decimal numbers. Whole numbers like 2298 do not have tenths.
You round to the nearest whole number.
work out
To the nearest whole number, that rounds down to 5.
Any number of 18.5 and greater will round off to 19
whole numbers have no part after the decimal point; therefore the answer is 9
If a number is already a whole number, and you are being asked to round it to the nearest whole number, then you don't need to round it anymore, since itself is the nearest whole number.
You cannot round a whole number like 2298 to the nearest tenth because tenths are used to round decimal numbers. Whole numbers like 2298 do not have tenths.
15 is the nearest whole number
The nearest whole number is 1.
Zero is the nearest whole number.
The nearest whole number is 7.
Some people find it easier to add or subtract whole numbers but yes, you could round to the nearest half.