The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 7813.
7813 has 4 digits. The digits in 7813 are 7, 8, 1, and 3.
When you are asking for the sum of the digits of 7813, you are basically asking what is
7 plus 8 plus 1 plus 3?
Therefore, the sum of the digits in 7813 is as follows:
7 + 8 + 1 + 3 = 19
Sum of digits in 7814
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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