18/72 = 25%
A fraction like 18/72 can show up when 18 out of 72 students choose the same lunch option, or when 18 of 72 items in a store are on sale. In either case, that amount is 25%, or one quarter of the total.
To picture it quickly, imagine a whole divided into four equal parts. 18/72 represents one of those four parts, so it is easy to estimate as about one-fourth.
A common mistake is thinking 18/72 is close to 18%, because people may focus only on the numerator. The denominator matters just as much because it tells you the size of the whole group.
