The LCM is their product.
The GCF is 1.
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Since 65 is a factor of 520, it is automatically the GCF.
The greatest common factor of 13 and 79 is 1.
5 x 13 = 65 2 x 3 x 13 = 78 2 x 3 x 5 x 13 = 390, the LCM
The GCF is 4.
The GCF is 13.