Greatest Common Factor (GCF) of 81 and 210

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To get the Greates Common Factor (GCF) of 81 and 210 we need to factor each value first and then we choose all the copies of factors and multiply them:

81:    3333  
210:   23   57
GCF:    3     

The Greates Common Factor (GCF) is:   3

 

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