The greatest common factor (GCF) is: 12
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The longest factor string is 2x2x2x3x13. It is always best to list your factor string from the least to greatest number.
312 156,2 78,2,2 39,2,2,2 13,3,2,2,2
These numbers are co-prime, ie have no common factor, so the LCM is the product, 312
312 156,2 78,2,2 39,2,2,2 13,3,2,2,2
The Least Common Multiple of 78 and 104 is 312.