Greatest Common Factor (GCF) of 840 and 21609

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To get the Greates Common Factor (GCF) of 840 and 21609 we need to factor each value first and then we choose all the copies of factors and multiply them:

840:   2223 57   
21609:      33 7777
GCF:      3  7   

The Greates Common Factor (GCF) is:   3 x 7 = 21

 

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