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There cannot be a greatest common factor 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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We're going to need that other number.

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12y ago
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18

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16y ago
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Q: What is the greatest common factor of 18 and 18?
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