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The factors of 20 are 1,2,4,5,10 and 20. For them to be common, they need to be compared to another set of factors. There cannot be a 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.
The factorsof 20 are 1, 2, 4, 5, 10, 20. For them to be common, they need to be compared to another set of factors.

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Q: What are the common factors of 20?
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