You need at least two numbers to find a GCF.
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The greatest common factor of 315 and 660 is 15.
154, 308, 462, 616, 770, 924, 1078 +154 . . .
Since 616 is a multiple of 8, it is automatically the LCM of this problem.
If that's 6, 16 and 24, the LCM is 48. If that's 616 and 24, the LCM is 1848.
These all divide 616 evenly: 1, 2, 4, 7, 8, 11, 14, 22, 28, 44, 56, 77, 88, 154, 308, 616.