It depends on the degree to which you are rounding:
To the nearest integer: 99.5
To the nearest 10: 95
To the nearest 100: 50
To the nearest n: 100 - n/2
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-98
99.5 rounds to 100 anything less 99.499999999 will round to 99 if you mean that you are rounding to the nearest integer. * * * * * Alternatively, any number larger than 50 will be rounded up to 100 when rounding to the nearest 100.
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 number that can be rounded to 400 (to the nearest 400) is 200.
500,000 is the least whole number that can be rounded to the nearest millions.