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  • Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
  • Factors of 45: 1, 3, 5, 9, 15, 45
  • GCF (72, 45) = 9
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Q: What are the greatest common factor of 72 and 45?
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