1, 2, 4 and 8
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The GCF is 8.
8 evenly divides all of the values, (3*8 = 24, 5*8 = 40, 7*8 = 56, 9*8 = 72), and, no other factors go into the numbers, thus 8 is the GCF.
The Greatest Common Factor of 56, 72, 64 is 8.
The common factors of 56, 64, and 72 are the numbers that can evenly divide each of these three numbers without leaving a remainder. The common factors of 56, 64, and 72 are 1, 2, 4, and 8. These numbers are factors of all three numbers since they can divide each of them evenly.
56 = 23 × 7 196 = 22 × 72