Rounding off numbers to their nearest mentioned position allows approximation from the number value itself.
In the number 63, 849
1. Rounding off to the nearest ten thousands would mean the value of 6 which is equal to 60, 000
2. Rounding off to the nearest thousands would mean the value of 3 which is equal to 64, 000
3. Rounding off to the nearest hundreds would mean the value of 8 which is equal to 63, 800
4. Rounding off to the nearest tens would mean the value of 4 which is equal to 63, 850
5. Rounding off to the nearest ones would mean the value of 9 which is equal to 63, 859.00
Since there are no decimal values the ones value stays the same. Take note of the rounding off rules between number 0-4 and 5-9.