56
There are 7 of them as 9 x 7 = 63.
10 times
6 of them with a remainder of 4
There are: 495/9 = 55
9 of them.
70 x 9 = 630
3 times with a remainder of 5
63
8, remainder 1
There are: 63/3 = 21
as in the multiples? 9 18 27 36 45 54 63 72 81 90 99 ...
5