13/40 as a percentage is 32.50%. This number tells you how much of a whole 13 parts out of 40 represent when you look at it in terms of 100. It’s a handy way to compare the fraction with other values that are already in percent form.
The fraction 13/40 can also be thought of as 13 pieces out of a set of 40 equal pieces. If you imagine a pizza cut into 40 slices, taking 13 slices would give you just under a third of the pizza. That “just under a third” is what the 32.50% expresses in everyday language.
When you work with percentages, they’re often easier to read than fractions, especially in reports or charts. So knowing that 13/40 equals 32.50% lets you quickly see its size relative to other percentages, like 25% or 50%, without having to do any extra math.