Greatest Common Factor (GCF) of 21 and 340

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To get the Greates Common Factor (GCF) of 21 and 340 we need to factor each value first and then we choose all the copies of factors and multiply them:

21:     3 7 
340:   22 5 17
GCF:         

The Greates Common Factor (GCF) is:   1

 

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