89/90 as a percentage is 98.89%. This number shows how close the fraction is to a whole, with only a tiny part missing.
The fraction 89/90 means you have 89 out of 90 equal pieces. In everyday terms, that’s almost everything—just one piece short of a full set.
Because the percentage is so high, it’s useful when you want to describe something that is nearly complete, like a test score, a project finish, or a success rate. The rounded value makes it easy to read and compare with other percentages.