31/40 as a percentage is 77.50%. This number tells you how much of a whole the fraction represents when you look at it on a scale of 100.
The fraction 31/40 means you have 31 parts out of a total of 40 equal parts. In everyday situations, you might see something like 31 out of 40 questions answered correctly on a test, or 31 minutes of a 40‑minute video watched.
When we write the result as 77.50%, it’s already rounded to two decimal places. This makes it easy to compare with other percentages, like a 75% pass mark or a 80% discount, without dealing with long decimal strings.