The fraction 40/64 is equal to 62.50% when converted to a percentage. This percentage represents how much of a whole the fraction represents. In other words, if you had 64 equal parts of something and took 40 of those parts, you'd have 62.50% of the whole.
To put this in perspective, 62.50% is more than half but less than two-thirds of a whole. It's a bit like filling up a gas tank that's just over 5/8 full. This fraction and percentage can be useful in various real-world situations, such as calculating grades, measuring ingredients in cooking, or determining the completion of a project.