Greatest Common Factor (GCF) of 78 and 42

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To get the Greates Common Factor (GCF) of 78 and 42 we need to factor each value first and then we choose all the copies of factors and multiply them:

78:   23 13
42:   237 
GCF:   23  

The Greates Common Factor (GCF) is:   2 x 3 = 6

 

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