Answer :

1,2,3,6,9,18,27,54
1,2,3,4,6,12,18,36,72
[tex]54|2\\27|3\\.\ 9|3\\.\ 3|3\\.\ 1|\\54=\fbox2\cdot\fbox3\cdot\fbox3\cdot3\\\\72|2\\36|2\\18|2\\.\ 9|3\\.\ 3|3\\.\ 1|\\72=\fbox2\cdot2\cdot2\cdot\fbox3\cdot\fbox3\\\\GCF(54;\ 72)=\fbox2\cdot\fbox3\cdot\fbox3=\boxed{\boxed{18}}[/tex]

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