5 and any multiple of 5
Any two multiples of 5 that differ by 5
20 and 25
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There can be only one GCF. 5 and 12 are coprime so GCF(5, 12) = 1
The GCF is 1.
The GCF of 5 and 10 is 5. The GCF of 4 and 12 is 4.
The GCF of 12 and 20 is 4.
GCF(145, 60) = 5.