Greatest Common Factor (GCF) of 840 and 7920

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To get the Greates Common Factor (GCF) of 840 and 7920 we need to factor each value first and then we choose all the copies of factors and multiply them:

840:   222 3 57 
7920:   2222335 11
GCF:   222 3 5  

The Greates Common Factor (GCF) is:   2 x 2 x 2 x 3 x 5 = 120

 

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