109
999 of them.
999
168
There are 169.
If 0 is not counted, and 1 is, then the answer is 1000.
125 if you include 1000.
sqrt(1000) = 31.62... So there are 31 (or 32 including 0 = 02).
Eight of them.
499 or 500.
243
265 ÷ 7 = 37.85714 or 37 with a remainder of 6.