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This is one of the first homeworks I use when reviewing fractions from the bottom up. Students need to find the prime factors of numbers, and explore divisibility rules for different numbers. It could easily be developed into a class activity by adding more examples and expanding the number block on the bottom half of the page to include all the numbers from 1-100. The final question asks students to do some critical thinking about prime and composite numbers, and is a good way to assess whether they really understand prime numbers or not.