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Digital Roots by Casting "9"

Posted by Unknown on 1:50 AM in ,



What is Digital root? 


If we add up the digits of a number until there is only one number left we have found what is called the digital root. In other words, the sum of the digits of a number is called its digital root.


Example:

For 5674, 5 + 6 + 7 + 4 = 22 and 2 + 2 = 4

» 4 is the digital root of 5674

One use of digital roots is for divisibility tests (like 3 and 9). This method makes it easier to calculate the digital root.

Example:



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Example: 

Find the digital root of 257520643

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Steps:

1. 2 + 7 = 9, cross out 2 and 7.

2.4 + 3+2 = 9, cross out 4, 3 and 2.

3.There are no other groups of numbers adding up to 9.

4.Add up the remaining digits, 5 + 5 + 0 + 3 = 13.

5.13 is more than 9, so 1 + 3 = 4.

6.The digital root is 4.

If there is nothing left after having cast out nines then the digital root is 9.

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