Because 6 times 12 is 72. A number, when multiplied by another number, is a factor of the new number.
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6 is not a prime number but it is a factor of 72
Because 6 is a factor of 72 and also because 72 is a multiple of 6.
6, 12, 18, 24, 36, 72
GCF(36, 42, 72) = 6
The GCF is 6.