9/80 = 11.25%
A value like 9/80, or 11.25%, can show up in everyday situations such as discounts, survey results, or the amount of a group choosing a certain option. For example, if 9 out of 80 students join a club, that club includes a little more than one-tenth of the students.
To picture 9/80 quickly, think of 10% as 8 out of 80, then notice that 9 out of 80 is just one more person. This makes it easy to estimate as slightly above 10%, or about 11%.
A common mistake is rounding 11.25% to 11% and treating the two values as exactly the same. Another point of confusion is assuming that 9/80 is close to 9/8, even though the much larger denominator makes 9/80 a much smaller amount.
