The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 519.
519 has 3 digits. The digits in 519 are 5, 1, and 9.
When you are asking for the sum of the digits of 519, you are basically asking what is
5 plus 1 plus 9?
Therefore, the sum of the digits in 519 is as follows:
5 + 1 + 9 = 15
Sum of digits in 520
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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