18/90 as a percentage is 20.00%. This simple fraction shows up in many everyday situations, like discounts or test scores, and it’s easy to remember that it rounds to a clean 20 percent.
The fraction 18/90 can be reduced to 1/5, which is the same as saying one part out of five equal parts. That reduction makes it clear why the percentage is so close to 20 %, because one‑fifth of any whole is exactly 20 %.
When you see 20.00% on a label or a report, you can think of it as “one out of five.” It’s a handy way to compare parts of a whole without doing a lot of math.
In school or work, using the percentage form often helps people understand the size of a part quickly. So, whenever you need to talk about 18/90, you can simply say 20.00% and be clear.
