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The GCF is 20.
20
The GCF is 45.
The GCF is 60.
The GCF is 180.
The GCF of 180 and 231 is 3.
The GCF is 11.
The greatest common factor of 220, 440, and 880 is 220
The GCF is 9.
The GCF is 4.
The GCF is 12.