80/100 = 80%
The fraction 80/100, or 80%, shows up in everyday life when something is mostly complete or successful. For example, you might score this much on a quiz, have this much battery left, or finish 80 out of 100 tasks on a checklist.
You can picture 80% as eight out of ten equal parts shaded or filled. It is also easy to estimate as “about four-fifths,” which helps you quickly recognize that it is a large amount but not the whole thing.
A common mistake is treating 80% as if it means 80 percentage points in every situation. For example, an 80% discount does not mean an item costs 80% more; it means the price is reduced by 80%, leaving only 20% to pay.
