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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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14y ago
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13y ago

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

42=2x3x7

165=3x5x11

GCF=3

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11y ago

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

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10y ago

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

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13y ago

The Greatest Common Factor (GCF) is: 1.

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11y ago

The GCF is 5.

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9y ago

The GCF is 55.

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8y ago

21

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13y ago

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