89/90 as a percentage is 98.89%. This fraction is just a tiny bit less than a whole, so when you look at it in terms of percent you see it’s very close to 100 %. It’s a handy way to understand how much of something is almost complete.
When you think of 89 out of 90 parts, picture a pizza cut into 90 slices and you’ve eaten 89 of them. You’ve enjoyed almost the entire pizza, missing only one slice. That “missing slice” shows up as the 1.11 % that’s not included in the total.
In everyday use, numbers like 98.89% can be useful for showing high scores, success rates, or quality checks. It tells people quickly that something is nearly perfect without having to write out the fraction each time.