180/320 = 56.25%
A value like 180/320, or 56.25%, could describe the portion of students who submitted an assignment on time. It might also represent how much of a sale item has been completed, how full a battery is, or the share of seats filled at an event.
You can picture it as a little more than half of a whole. Since 50% is one-half, 56.25% is about six parts out of ten, though it is slightly less than three-fifths.
A common mistake is treating 56.25% as if it were close to 60% exactly. It is also easy to confuse the fraction with 320/180, which would represent a completely different amount and would be greater than one whole.