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Eleven.
20
Five 9s:(99 x 9 + 9) / 9 = 100
11
There are exactly 20 Nines. 9,19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98 which totals 18 and the last number 99 has 2 nines and therefore 20 nines in total.
5
8
79
9^2+9+9 +9/9 81+9+9+1=100
One way: 99 + 9/9 = 100
The GCF of 9s and 63s^3 is 9s.
10 times