Greatest Common Factor (GCF) of 21 and 1224

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To get the Greates Common Factor (GCF) of 21 and 1224 we need to factor each value first and then we choose all the copies of factors and multiply them:

21:      3 7 
1224:   22233 17
GCF:      3   

The Greates Common Factor (GCF) is:   3

 

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