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There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.

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14y ago

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The greatest common factor of the numbers 39 and 64 is 1.

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10y ago
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The greatest common factor (GCF) of 27 and 39 is 3.

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13y ago
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The Greatest Common Factor (GCF) is: 3

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14y ago
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The GCF is 3.

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7y ago
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The GCF is 13.

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9y ago
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3 is.

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12y ago
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Q: What is the highest common factor of 24 and 39?
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