The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 520.
520 has 3 digits. The digits in 520 are 5, 2, and 0.
When you are asking for the sum of the digits of 520, you are basically asking what is
5 plus 2 plus 0?
Therefore, the sum of the digits in 520 is as follows:
5 + 2 + 0 = 7
Sum of digits in 521
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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