The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2639.
2639 has 4 digits. The digits in 2639 are 2, 6, 3, and 9.
When you are asking for the sum of the digits of 2639, you are basically asking what is
2 plus 6 plus 3 plus 9?
Therefore, the sum of the digits in 2639 is as follows:
2 + 6 + 3 + 9 = 20
Sum of digits in 2640
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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