9 of them.
9*9=81 81-9=72 72/9=88
as in the multiples? 9 18 27 36 45 54 63 72 81 90 99 ...
9^2+9+9 +9/9 81+9+9+1=100
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108
The pattern is: 9, 18, 27, 36, 45, 54, 63, 72, 81, and 108.
5
79
The GCF of 9s and 63s^3 is 9s.
10 times
Exactly 6 of them
24 of them with a remainder of 2