21/90 as a percentage is 23.33%. This is the rounded value you get when you turn the fraction into a percent, keeping two decimal places.
The fraction 21/90 can be reduced to 7/30, which still represents the same part of a whole. Both forms show that a little less than one‑quarter of something is being described.
In everyday life, you might see this percentage on a test score, a discount, or a measurement where precise numbers matter. It tells you that roughly 23 out of every 100 units are covered.
Remember, whenever you need to compare a part to a whole quickly, turning the fraction into a percentage—like 23.33%—makes it easier to understand at a glance.
