Q: What is the digital root of 640,020,438
A: 9
The digital root of a number is calculated by splitting the digits of a number and then adding them together. You keep splitting and adding the digits until you reach a single positive number.
Split the number up and add each digit together:
If the answer is more than one digit, you would add each digit of the answer together again:
What is the digital root of number 640,020,438?
Answer: 9
Number | 640,020,436 | 640,020,437 | 640,020,439 | 640,020,440 |
Digital Root | 7 | 8 | 1 | 2 |