The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 6439.
6439 has 4 digits. The digits in 6439 are 6, 4, 3, and 9.
When you are asking for the sum of the digits of 6439, you are basically asking what is
6 plus 4 plus 3 plus 9?
Therefore, the sum of the digits in 6439 is as follows:
6 + 4 + 3 + 9 = 22
Sum of digits in 6440
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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