The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2005.
2005 has 4 digits. The digits in 2005 are 2, 0, 0, and 5.
When you are asking for the sum of the digits of 2005, you are basically asking what is
2 plus 0 plus 0 plus 5?
Therefore, the sum of the digits in 2005 is as follows:
2 + 0 + 0 + 5 = 7
Sum of digits in 2006
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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