Middle School:
Question: There are 2,700 residents of Casey, Illinois, home of the world's largest mailbox. The mailbox is so big that a group of people can stand inside it. If there are 135 people standing inside the mailbox, what percentage of the population of Casey is in the mailbox?
Answer: 5%
Solution: One way to solve this problem is to reason that a percentage is out of 100, and there are 27 hundreds in 2,700. So, to find the percentage, we want to know what number goes into 135, 27 times: 135 ÷ 27 = 5. So, there are 5 residents for each hundred, meaning there are 5% of the residents in the mailbox.
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