The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 5390.
5390 has 4 digits. The digits in 5390 are 5, 3, 9, and 0.
When you are asking for the sum of the digits of 5390, you are basically asking what is
5 plus 3 plus 9 plus 0?
Therefore, the sum of the digits in 5390 is as follows:
5 + 3 + 9 + 0 = 17
Sum of digits in 5391
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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