Normally, that question would include a number."What is the least possible whole number before rounded off to 100?"
Under conventional rounding to the nearest 100 the lowest integer would be 50.
Without a number, there is no lowest possible number. Numbers don't stop.
The least possible number that can be rounded off to 25000 is 24995.
85500
5.445
8.55
It is: 3.25
The least possible number that can be rounded off to 10.72 10.652
The least possible number that can be rounded off to 25000 is 24995.
8.345 can be rounded to 8.35
25450
85500
5.445
8.55
It is: 3.25
24500
550
24500
1999 is the greatest possible number which can be rounded off to 2000, which has 1500 as the least.