Since 2mn is a factor of 4m2n2, the latter is automatically the GCF.
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You don't; you need at least two numbers to find a GCF.
You need at least two numbers to find a GCF. The GCF of 18 and 24 is 6.
Find their GCF. If their GCF is 1, they are co-prime. Since their GCF is 33, they are not.
The GCF is 8.
The GCF is 1.