The fraction 10/25 is equal to 40.00%. This is the percentage you get when you look at the part of the whole that 10 represents out of 25.
When you simplify 10/25, you get the simpler fraction 2/5. Both fractions describe the same size relationship, just with different numbers.
A percentage like 40.00% is useful when you want to compare parts of a whole in everyday situations—like seeing that 40 % of a class of 25 students got a perfect score.
Remember, 10/25 and 40.00% are just two ways to talk about the same proportion, making it easy to switch between fraction and percent depending on what you need.