64/80 = 80%
The fraction 64/80, or 80%, can show up in everyday life when 64 out of 80 people choose a certain option. For example, it could describe a test score, the amount of a project completed, or the percentage of customers who enjoyed a product.
You can picture 80% as four-fifths of a whole, with only one-fifth left over. A quick estimate is that it is close to three-quarters, but noticeably higher.
A common mistake is treating 80% as if it means 80 items instead of 80 out of every 100. The actual number represented depends on the total, so 80% of 80 is different from 80% of 200.