Greatest Common Factor (GCF) of 20 and 4

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To get the Greates Common Factor (GCF) of 20 and 4 we need to factor each value first and then we choose all the copies of factors and multiply them:

20:   225
4:   22 
GCF:   22 

The Greates Common Factor (GCF) is:   2 x 2 = 4

 

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