GCF
Find the GCF of  72 and 144
Find the GCF of  16 and 12
Find the GCF of  36 and 60
Find the GCF of  21 and 54
Find the GCF of  36 and 72
Find the GCF of  33 and 27
Find the GCF of  70 and 28
Find the GCF of  12 and 80
Find the GCF of  12, 18 and 60
Find the GCF of  42, 28 and 56
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