To convert a fraction to a percentage, we need to multiply it by 100. So, to find the percentage of 81/9, we can first simplify the fraction by dividing both the numerator and denominator by 9. This gives us 9/1.

Now, to convert 9/1 to a percentage, we multiply it by 100.

9/1 x 100 = 900%

Therefore, 81/9 as a percentage is 900%. This means that 81/9 is equivalent to 900 out of 100, or 9 out of 1, when expressed as a percentage.