Four pairs:
54 and 1
27 and 2
18 and 3
9 and 6
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The common factors of 54 and 78 are 1, 2, 3, 6.
A factor is any number which can be divided into the given number with no remainder. i.e 1, 2, 3, 6, 9, 18, 27, 54
1 x 108 2 x 54 3 x 36 4 x 27 6 x 18 9 x 12 and the reverse of each of the same pairs
The GCF is 3.
1,2,3,6,9,18,27 and 54