The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 8391.
8391 has 4 digits. The digits in 8391 are 8, 3, 9, and 1.
When you are asking for the sum of the digits of 8391, you are basically asking what is
8 plus 3 plus 9 plus 1?
Therefore, the sum of the digits in 8391 is as follows:
8 + 3 + 9 + 1 = 21
Sum of digits in 8392
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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