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The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.

The greatest common factor of 42 and 385 is 7

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Prime factor each term then multiply all the common prime numbers together to get the GCF.

42=2x3x7

165=3x5x11

GCF=3

Factors of 165: 1, 3, 5, 11, 15, 33, 55, 165

Factors of 385: 1, 5, 7, 11, 35, 55, 77, 385

GCF (165, 385) = 55

To have a common factor, you have to have two or more numbers.

The factors of 385 are: 1, 5, 77, 385

1 x 385

5 x 77

The Greatest Common Factor (GCF) is: 1.

The GCF is 5.

The GCF is 55.

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Q: Greatest common factor of 42 and 165?

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Since 3 is a factor of 42, it is automatically the GCF.

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The GCF of 42 and 165 is 3

The GCF is 1.

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