The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 3521.
3521 has 4 digits. The digits in 3521 are 3, 5, 2, and 1.
When you are asking for the sum of the digits of 3521, you are basically asking what is
3 plus 5 plus 2 plus 1?
Therefore, the sum of the digits in 3521 is as follows:
3 + 5 + 2 + 1 = 11
Sum of digits in 3522
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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