It's already there.
489334209 rounded to the nearest millionth is 489000000.
489000000
I'm not sure what a whole decimal is. You could round to a whole number (489334209) or a decimal (489334209.0)
489,000,000
490,000,000
489334000
489,334,209 rounded to the nearest million is 489,000,000
If you are rounding to the 9 on the right, the number stays the way it is. If you are rounding to the 9 on the left, it rounds to 489000000
You cannot round 489334209 to 9000000.
The answer depends on the degree to which the number needs to be rounded.
If you are rounding to the 9 on the right, the number stays the way it is. If you are rounding to the 9 on the left, it rounds to 489000000
If you are rounding to the 9 on the right, the number stays the way it is. If you are rounding to the 9 on the left, it rounds to 489000000