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.
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The factors of 56 are:
1, 2, 4, 7, 8, 14, 28, 56
The factors of 72 are:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The common factors are:
1, 2, 4, 8
The factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54
The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The common factors are: 1, 2, 3, 6, 9, 18
The Greatest Common Factor of 56, 72, 64 is 8.
1, 2, 4 and 8
Since 24 is a factor of 72, all of its factors are common.
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.