Greatest Common Factor (GCF) of 42 and 198

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To get the Greates Common Factor (GCF) of 42 and 198 we need to factor each value first and then we choose all the copies of factors and multiply them:

42:   23 7 
198:   233 11
GCF:   23   

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

 

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