Five 9s:
(99 x 9 + 9) / 9 = 100
9^2+9+9 +9/9 81+9+9+1=100
Take two 9s and make them a fraction like this 9/9. Then put the other two 9s together to make 99 and you get 9/9+99=100. Because 9/9=1 so it becomes 1+99=100.
9÷9+99 or 99+9÷(9)
5
8
9^2+9+9 +9/9 81+9+9+1=100
It is five.
Eleven.
99 plus 9/9 = 100
20
(99)/(99) +9.
(9*9)+(9+9)+(9/9) = 100
11
Yes, there are an infinite number of posibilities. Staying only with positive odd numbers, if duplicates are allowed, then five 9s and five 11s make 100. If duplicates are disallowed, then 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100
11 with 1 remaining 100 - 1 = 99 = 9 x 11
One way: 99 + 9/9 = 100
The GCF of 9s and 63s^3 is 9s.