Greatest Common Factor (GCF) of 45 and 780

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To get the Greates Common Factor (GCF) of 45 and 780 we need to factor each value first and then we choose all the copies of factors and multiply them:

45:     335 
780:   223 513
GCF:     3 5 

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

 

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