10/80 = 12.5%
A value like 12.5% might describe how many students in a class ride the bus, or how much of a phone’s battery has been used. The fraction 10/80 could also represent 10 items out of a group of 80.
To picture it quickly, think of a little more than one-tenth of a whole. If a whole is split into eight equal parts, 10/80 is the same size as one of those parts.
A common mix-up is thinking that 12.5% means 12.5 out of 100 actual items, no matter how large the group is. It describes a share of the total, so the number of items depends on how many there are altogether.
