Greatest Common Factor (GCF) of 129 and 21

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To get the Greates Common Factor (GCF) of 129 and 21 we need to factor each value first and then we choose all the copies of factors and multiply them:

129:   3 43
21:   37 
GCF:   3  

The Greates Common Factor (GCF) is:   3

 

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