45/57 as a percentage is 78.95%. This is the rounded result you get when you compare the fraction to a whole.
The fraction 45/57 can be reduced by dividing both numbers by their greatest common divisor, which is 3, giving 15/19. Even in its simplest form, it still represents a little less than four‑fifths of a whole.
Knowing that 78.95% is the equivalent percentage can help when you need to compare this part to other percentages, like test scores or discounts, without having to work with the fraction directly.
