21/24 = 87.5%
A value like 21/24, or 87.5%, can show up when 21 out of 24 students turn in an assignment on time. It might also describe a mostly full battery, a strong quiz score, or the portion of a work project that has been completed.
To picture 21/24 quickly, imagine a bar divided into eight equal parts with seven parts filled. It is a little less than nine-tenths, so you can estimate it as close to 90% without treating it as exactly 90%.
A common mistake is to think 87.5% means 87.5 out of 100 separate items in every situation. Percentages describe an equivalent share, so the same amount can be represented by 21 out of 24 even though the numbers in the fraction are different.
