600
500
To the nearest hundred, 100.
7500
949.9999...
6450 to 6549 to the nearest hundred
Any from 450 to 549
749 rounded to the nearest hundred is 700
1400
The greatest whole number would be 499.
The question is ambiguous. For example, 3352.8 can be rounded to 3352.8 to the nearest tenth, 3400 to the nearest hundred, or 0 to the nearest ten thousands.
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900