The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2645.
2645 has 4 digits. The digits in 2645 are 2, 6, 4, and 5.
When you are asking for the sum of the digits of 2645, you are basically asking what is
2 plus 6 plus 4 plus 5?
Therefore, the sum of the digits in 2645 is as follows:
2 + 6 + 4 + 5 = 17
Sum of digits in 2646
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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