81/90 as a percentage is 90.00%. This tells you that the fraction is very close to a whole number, just a little short of 1.
The fraction 81/90 can be simplified by dividing both the numerator and the denominator by 9, which gives 9/10. That makes it easy to see why the percentage is so high—9 out of every 10 parts are present.
When you look at it as a percentage, 90.00% means that out of every 100 parts, 90 are filled. It’s a handy way to compare the fraction to other values that are also expressed in percent.
In everyday language, you could say the fraction represents a 90 % success rate, a 90 % completion, or any similar idea where you want to show that something is almost complete.