How many multiples of 9 are between 100,000 and 100,185, 723?
The first multiple of 9 above 100,000 is:
100,008.
The last mutiple of 9 is:
100,185,723 itself.
[100,185,723 - 100,008] / 9 + 1 ==11,120,636 multiples of 9 between 100,000 and 100,185,723.
