135 = 33 * 5
315 = 5 * 43
It is 5 because 5 is in both rows.
What about 15? Is it the greater common factor?
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The GCF of 18 and 315 is: 9
The greatest common factor of 315 and 660 is 15.
The GCF is: 45
The GCF is 21.
It is: 3