64/80 = 80%
A fraction like 64/80 could show up as a test score, a survey result, or the share of seats filled at an event. It means 80% of the whole is included, which is a strong majority.
To picture it quickly, imagine a bar split into five equal sections with four shaded in. That gives you a good sense of how close the amount is to the whole without needing to count every part.
One common mix-up is thinking the 80 refers to the number of parts shown, rather than the size of the whole. In 64/80, the denominator tells you the total number of equal parts, so the same top number could mean something different if the denominator changed.