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A Digital Root Problem (Posted on 2006-06-29) Difficulty: 2 of 5
The digital root of a number is obtained by summing its digits and then repeating the process (summing the sum's digits) until the answer is a single digit number. For example, the digital root of 7368 is 6.

Determine the digital root of (97240+38)8457

See The Solution Submitted by K Sengupta    
Rating: 4.0000 (2 votes)

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Hint | Comment 1 of 10
if S(x)=digital root of x

 then there are two properties you can use
s(a+b)=s(s(a)+s(b))
s(ab)=s(s(a)s(b))

:-D

  Posted by Daniel on 2006-06-29 11:43:35
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