Greatest Common Factor (GCF) of 138 and 40

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To get the Greates Common Factor (GCF) of 138 and 40 we need to factor each value first and then we choose all the copies of factors and multiply them:

138:   2  3 23
40:   222 5 
GCF:   2     

The Greates Common Factor (GCF) is:   2

 

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