So, without further ado, I present to you digital root extraction.
Step 1: What is a Digital Root?
A better demonstration would be to take a number (such as 179) and demonstrate. So, the digital root of 179 is something like this:
179 -> 1+7+9 = 17 -> 1+7 = 8
So, the digital root of 179 is 8.
Another, more interesting way to look at a digital root is that it is a modulo 9 operator. In other words, if you were to divide the number by 9, the integer remainder and the digital root are the same thing. So, digital roots can be rewritten as mod9(Number).
Now that we know what digital roots are, let's go ahead and find them.