Greatest Common Factor (GCF) of 1240 and 21

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To get the Greates Common Factor (GCF) of 1240 and 21 we need to factor each value first and then we choose all the copies of factors and multiply them:

1240:   222 5 31
21:      3 7 
GCF:          

The Greates Common Factor (GCF) is:   1

 

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