Yes
900 of them.
3 of them.
-999
144, 324, 576, 900
102.
Yes.
850
450 or 900
All the whole numbers between 99 and 1,000. Simple subtraction will give you a number, if that's what you meant to ask. 900, the numbers above are exclusive.
If the digits of the number add up to a multiple of 3, the whole number is divisible by 3.
888
101 is the smallest 3 digit odd whole number