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.
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The greatest common factor (GCF) is: 8
The GCF is 8.
The answer is 2.
The GCF is 8.
The Greatest Common Factor of 175 and 56 is 7.