Greatest Common Factor (GCF) of 390 and 220

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To get the Greates Common Factor (GCF) of 390 and 220 we need to factor each value first and then we choose all the copies of factors and multiply them:

390:   2 35 13
220:   22 511 
GCF:   2  5  

The Greates Common Factor (GCF) is:   2 x 5 = 10

 

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