I'm not sure what a whole decimal is. You could round to a whole number (489334209) or a decimal (489334209.0)
It is 489334209, exactly as in the question.
489334000
490,000,000
2.5 when rounded to the nearest whole number is 3
You can not round a whole number to a decimal number.
It is already rounded to a whole number as it is.
489334209 rounded to the nearest millionth is 489000000.
It's already there.
489000000
489,000,000
489334000
490,000,000
489,334,209 rounded to the nearest million is 489,000,000
2.5 when rounded to the nearest whole number is 3
It is: 7
You can not round a whole number to a decimal number.
It is already rounded to a whole number as it is.
73