Q: What is the digital root of 21

 A: 3

Why is 3 the digital root of the number 21?

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?


Split the number up and add each digit together:


2 + 1 = 3


What is the digital root of number 21?

Answer: 3


More Examples

Number 19202223
Digital Root 1245

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