February 27th, 2012, 11:56 AM  #1 
Newbie Joined: Feb 2012 Posts: 2 Thanks: 0  digital roots
The digital root of the product of the digital roots of the factors = the digital root of the product. Does anyone know how to prove this? 
August 10th, 2014, 10:48 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,098 Thanks: 1905 
Yes, I know. Hint: convert to base 9.


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