Greatest Common Factor (GCF) of 75 and 42

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To get the Greates Common Factor (GCF) of 75 and 42 we need to factor each value first and then we choose all the copies of factors and multiply them:

75:    355 
42:   23  7
GCF:    3   

The Greates Common Factor (GCF) is:   3

 

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