21/25 as a percentage is 84.00%. This is the rounded figure you get when you write the fraction in percent form with two decimal places.
The fraction 21/25 can also be shown as a decimal: 0.84. It’s a tidy number because the denominator (25) is a factor of 100, which makes the conversion to percent straightforward. When you think of it in everyday terms, 21 out of every 25 parts are included.
In many real‑world situations, such as grading or statistics, you’ll see this kind of percentage. The “.00” part tells you the value is exact to two decimal places, which is useful when precision matters, but the number is still easy to read and understand.