Greatest Common Factor (GCF) of 28 and 155

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To get the Greates Common Factor (GCF) of 28 and 155 we need to factor each value first and then we choose all the copies of factors and multiply them:

28:   22 7 
155:     5 31
GCF:        

The Greates Common Factor (GCF) is:   1

 

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