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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.
The GCF of 18, 12 and 36 is 6. The GCF of 1812 and 36 is 12.