Greatest Common Factor (GCF) of 100 and 20

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To get the Greates Common Factor (GCF) of 100 and 20 we need to factor each value first and then we choose all the copies of factors and multiply them:

100:   2255
20:   225 
GCF:   225 

The Greates Common Factor (GCF) is:   2 x 2 x 5 = 20

 

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