Greatest Common Factor (GCF) of 18 and 30

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To get the Greates Common Factor (GCF) of 18 and 30 we need to factor each value first and then we choose all the copies of factors and multiply them:

18:   233 
30:   23 5
GCF:   23  

The Greates Common Factor (GCF) is:   2 x 3 = 6

 

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