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Name Practice 9.3 Date Greatest Common Factor List the factors of each number. Then find the greatest common factor of the numbers. 1. 28 32 2. 12 18 3. 21 40 4. 16 32 5. 35 42 6. 20 33 7. 32 45 8. 18 22 9. 19 38 Write the prime factorization using exponents of each number. Then find the greatest common factor (GCF) of the numbers. 10. 12 15 11. 8 13. 60 72 14. 66 18 99 12. 10 45 15. 42 126 Test Prep 16. Find the GCF of 18 and 42. A 2 C 6 B 3 D 18 Copyright © Houghton Mifflin Company. All rights reserved. 17. Find the GCF of 32 and 36. Explain how you got your answer. Use with text pages 228–231.