199
If it's 200 rounded to nearest ten, then the number must be between 195 and 205. Only 199 has the correct digit sum.
196, 198, 202, 204
the answer is 135
266, 267, 268
2 is prime, its only factors are one and itself.
12
0.12 Or 102 if you do not want to include non integers.
The smallest 3 digit counting number less than 1000?? 100
4*9 = 36 so 360 is one possible answer.
111,112,121,211,122,212,221,222,113,131,311,133,313,331,333,223,232,322,233,323,332,123, 132, 213, 231, 312, 321