The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 13.|
13 has 2 digits. The digits in 13 are 1 and 3.
When you are asking for the sum of the digits of 13, you are basically asking what is
1 plus 3?
Therefore, the sum of the digits in 13 is as follows:
1 + 3 = 4
Sum of digits in 14
See if you can calculate the sum of the digits in the next number on our list before you go here.