80/90 = ≈88.89%
Rounded to 2 decimal places.
A value like 80/90, or about 88.89%, could describe a quiz score, a project that is nearly finished, or seats filled at an event. It shows that most of the whole is there, though a small part is still missing.
To picture it quickly, imagine a bar that is almost completely shaded, with just over one-tenth left blank. You can also think of it as close to 9 out of every 10 parts.
A common mix-up is to read 80/90 as 80% because the top number is 80. But the fraction compares 80 parts with a total of 90, so the denominator—the bottom number—matters too.