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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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Earn +20 ptsQ: What is the greatest common factor of45 and 75?
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What is the greatest common factor of 75 112?
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