The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2040.
2040 has 4 digits. The digits in 2040 are 2, 0, 4, and 0.
When you are asking for the sum of the digits of 2040, you are basically asking what is
2 plus 0 plus 4 plus 0?
Therefore, the sum of the digits in 2040 is as follows:
2 + 0 + 4 + 0 = 6
Sum of digits in 2041
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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