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It is: 20
7
8
20
The greatest common factor of 15 and 40 is 5
The GFC= 2 :)LOL
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It is: 40
The GCF is 30.
The GCF is 8.
The GCF is 1.
The GCF of 60 and 120 is 60.
The GCF would be 10.
Since 20 is a factor of 60, it is automatically the GCF.