Greatest Common Factor (GCF) of 105 and 20

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To get the Greates Common Factor (GCF) of 105 and 20 we need to factor each value first and then we choose all the copies of factors and multiply them:

105:     357
20:   22 5 
GCF:      5 

The Greates Common Factor (GCF) is:   5

 

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