That depends on the numbers you're comparing. 6 is the GCF of 12 and 18. 9 is the GCF of 18 and 27.
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The greatest common factor (GCF) is: 3
Greatest Common Divisor (GCD) for 6 9 is 3
9 and 6 don't go into the factor, the factor goes into 9 and 6. The GCF of 9 and 6 is 3.
6 = 2 * 3. 9 = 3 * 3. So the greatest common factor is 3.
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