Greatest Common Factor (GCF) of 209 and 638

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To get the Greates Common Factor (GCF) of 209 and 638 we need to factor each value first and then we choose all the copies of factors and multiply them:

209:    1119 
638:   211 29
GCF:    11  

The Greates Common Factor (GCF) is:   11

 

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