Greatest Common Factor (GCF) of 645 and 630

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To get the Greates Common Factor (GCF) of 645 and 630 we need to factor each value first and then we choose all the copies of factors and multiply them:

645:    3 5 43
630:   23357 
GCF:    3 5  

The Greates Common Factor (GCF) is:   3 x 5 = 15

 

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