The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2578.
2578 has 4 digits. The digits in 2578 are 2, 5, 7, and 8.
When you are asking for the sum of the digits of 2578, you are basically asking what is
2 plus 5 plus 7 plus 8?
Therefore, the sum of the digits in 2578 is as follows:
2 + 5 + 7 + 8 = 22
Sum of digits in 2579
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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