The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 813.
813 has 3 digits. The digits in 813 are 8, 1, and 3.
When you are asking for the sum of the digits of 813, you are basically asking what is
8 plus 1 plus 3?
Therefore, the sum of the digits in 813 is as follows:
8 + 1 + 3 = 12
Sum of digits in 814
See if you can calculate the sum of the digits in the next number on our list before you go here.
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