Greatest Common Factor (GCF) of 205 and 21

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To get the Greates Common Factor (GCF) of 205 and 21 we need to factor each value first and then we choose all the copies of factors and multiply them:

205:    5 41
21:   3 7 
GCF:       

The Greates Common Factor (GCF) is:   1

 

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