4/5 = 80%
The fraction 4/5, or 80%, shows up in everyday life when most of something is complete or available. For example, you might finish 4 out of 5 homework problems, fill 4 out of 5 sections of a progress bar, or answer 4 out of 5 questions correctly.
To picture 4/5 quickly, imagine five equal slices, boxes, or spaces with four shaded in and one left empty. It is also easy to estimate as “about four out of every five,” which is a large majority but not quite the whole amount.
A common mistake is to treat 4/5 as if it means 4 out of 10, which would be only 40%. Another point of confusion is forgetting that 4/5 is less than 100% because one-fifth, or 20%, is still missing.
