Q: What is the digital root of 21,178,540

Why is 1 the digital root of the number 21,178,540?

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.

How do you calculate the digital root of 21,178,540?

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:

The answer is more than one digit again, we need to add each digit one more time:

What is the digital root of number 21,178,540?

Answer: 1

More Examples