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The only method is to count the sum total of all digits, as does dCode.

Example:123 $ 1+2+3 = 6 $

Pay attention to say sum of the digits of a number (the expressions such as the sum of a digit, or the sum of a number are meaningless)

How to calculate a digital root?

The digital root is computed through recursive reduction (repeated sum) that consists in repeating the addition operation until the result has only one digit.

Example:789: $ 7+8+9 = 24 $ and $ 2+4 = 6 $

A mathematical formula makes it possible to calculate the numerical root $ r $ directly: $$ r(n) = n - 9 \left\lfloor \frac{n}{9} \right\rfloor $$

What is the difference between a number and a digit?

A number is made of digits, like a word is made of letters.

Example: There are only 10 digits: 0,1,2,3,4,5,6,7,8,9 (in base 10)

Example: There is an infinity of numbers

Numbers can have only one digit such as 1, 2 ou 3 (they are both numbers and digits)

Source code

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Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Sum of Digits' tool, so feel free to write! Thank you!

Thanks to your feedback and relevant comments, dCode has developed the best 'Sum of Digits' tool, so feel free to write! Thank you!