21/24 = 87.5%
A value like 21/24, or 87.5%, might show up as a quiz score, a battery level, or the share of people who answered a poll a certain way. It describes something that is close to complete, but not quite there.
To picture it quickly, imagine a full bar split into 24 equal parts, with 21 filled in. That’s a little less than 7/8 of the bar, so you can estimate it as just under 90%.
One common point of confusion is treating 87.5% as the same as 87%. The extra half of a percent may seem small, but it can matter when comparing scores or tracking changes.