9*9/9 = 9
or 9+9-9 = 9
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9 of them.
To get 100 using five 9s, you can use the following mathematical expression: (99 + 9/9) = 100 This equation involves adding 99 to the result of 9 divided by 9, which equals 1. This gives you a total of 100 using five 9s.
There are: 495/9 = 55
9^2+9+9 +9/9 81+9+9+1=100
9÷9+99 or 99+9÷(9)