72/90 as a percentage is 80.00%. This is the rounded value you get when you compare the fraction to a whole.
The fraction 72/90 can be simplified by dividing both the top and bottom numbers by their greatest common divisor, which gives you 4/5. That shows the same proportion in a smaller form.
When you think of 4/5, it’s easy to see that it’s four parts out of five, which is the same as eighty out of one hundred. That’s why the percentage matches the simplified fraction.
In everyday use, you might see the 80 % figure on a chart or a test score, and it tells you the same thing as the original 72/90 fraction—just in a format that’s quick to read.
