9 of them.
9*9=81 81-9=72 72/9=88
Write the repeating digits over the same number of 9s and simplify: 0.81... has two repeating digits ⇒ the denominator has two 9s, ie 99. ⇒ 0.81... = 81/99 = 9/11
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
8
79
The GCF of 9s and 63s^3 is 9s.
10 times