The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 8515.
8515 has 4 digits. The digits in 8515 are 8, 5, 1, and 5.
When you are asking for the sum of the digits of 8515, you are basically asking what is
8 plus 5 plus 1 plus 5?
Therefore, the sum of the digits in 8515 is as follows:
8 + 5 + 1 + 5 = 19
Sum of digits in 8516
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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