Digital roots or Digital Sum of Numbers
The word Digit means the single figure numbers; the numbers from 1 to 9 and zero Digital Root or Digital Sum of a number : is the remainder when the number is divided by 9. So for 31, the remainder is 4 because 31/ 9 = 3 remainder 4. The digital root is also 4. The digital root can also be obtained by summing the digits of the number.