13 is a factor of both 78 (6 times) and 104 (8 times).
Since 13 is also obviously a factor of itself, it must be the greatest factor
that's common to all three numbers.
(If there were a greater one, then 13 would have a factor greater than itself.)
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The GCF is 26. The LCM is 312.
The GCF is: 13
The factors of 78 are: 1, 2, 3, 6, 13, 26, 39, 78 The factors of 91 are: 1, 7, 13, 91 The factors of 156 are: 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156 The common factors are: 1, 13 The Greatest Common Factor: GCF = 13
The factors of 78 are:1, 2, 3, 6, 13, 26, 39, 78The factors of 104 are:1, 2, 4, 8, 13, 26, 52, 104The factors of 117 are:1, 3, 9, 13, 39, 117The common factors are:1, 13The Greatest Common Factor:GCF = 13
The GCF is 13.