18/90 = 20%
The fraction 18/90 represents 20%, or one-fifth of a whole. You might see a value like this when 18 out of 90 students choose the same lunch, 18 of 90 products are on sale, or a survey finds that one-fifth of people share an opinion.
To picture 20% quickly, imagine dividing something into five equal parts and focusing on one part. On a 100-square grid, it would cover about two full rows, which makes it easy to estimate as a small but noticeable portion.
A common mistake is to think 18/90 is 18% because the numerator is 18. The denominator matters because it tells you the total amount, so 18 out of 90 is much larger than 18 out of 100.
