1 and 3
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The least common factor of any set of positive integers is 1.
Factors of 8: 1, 2, 4, 8 Factors of 12: 1, 2, 3, 4, 6, 12 GCF (8, 12) = 4
The LCM is: 444
The GCF is 4.
Common factors of 9 and 18 are: 1, 3 and 9. Factors of 9: 1, 3, 9 Factors of 18: 1, 2, 3, 6, 9, 18