Name _________________________

2.1 Prime Factorization

List out factors for each of the following numbers.

1. 12

2. 10

3. 15

4. 16

5. 56

6. 18

7. 20

8. 22

9. 23

10. 25

11. 27

12. 31

13. 81

14. 48

15. 24

16. 30

Use what you have learned about prime and composite numbers to answer the following questions.

17. Are any of the numbers in problems 1 – 16 prime?

18. Name them.

19. What is a prime number?

20. What is composite number?

Answer each question using the rules of divisibility. Explain your answer.

21. Is 246 divisible by 2?

22. Is 393 divisible by 3?

23. Is 7450 divisible by 10?

Draw a factor tree and write 56 as a product of its primes.

24. 56