The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 3409.
3409 has 4 digits. The digits in 3409 are 3, 4, 0, and 9.
When you are asking for the sum of the digits of 3409, you are basically asking what is
3 plus 4 plus 0 plus 9?
Therefore, the sum of the digits in 3409 is as follows:
3 + 4 + 0 + 9 = 16
Sum of digits in 3410
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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