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The GCF is 4.
8
2
The GCF is 2.
72
The GCF is 2. The LCM is 240.
72, 144, 216 and so on.
The GCF is 36.
The GCF is 6.
The GCF is 9.
2 because it is the only number that can go into both of them (besides 1 :P)