What Is The Smallest 3 Digit Number Divisible By 5 And 9?

In order for a number to be divisible by both 5 and 9, it must be divisible by the least common multiple of 5 and 9, which is 45.
100/45 = 2 2/9, so the smallest 3-digit multiple of 45 is 3*45.
3*45 = 135

The number you seek is 135.