Greatest Common Factor (GCF) of 420 and 645

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To get the Greates Common Factor (GCF) of 420 and 645 we need to factor each value first and then we choose all the copies of factors and multiply them:

420:   22357 
645:     35 43
GCF:     35  

The Greates Common Factor (GCF) is:   3 x 5 = 15

 

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