Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 20: 1, 2, 4, 5, 10, 20
Factors of 45: 1, 3, 5, 9, 15, 45
GCF (12, 20, 45) = 1
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The greatest common factor of 12 and 20 is 4
The GCF of 4, 12, and 20 is 4The GCF is: 4
The GCF is 2.
The GCF is 4.
The GCF is 2.