The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2421.
2421 has 4 digits. The digits in 2421 are 2, 4, 2, and 1.
When you are asking for the sum of the digits of 2421, you are basically asking what is
2 plus 4 plus 2 plus 1?
Therefore, the sum of the digits in 2421 is as follows:
2 + 4 + 2 + 1 = 9
Sum of digits in 2422
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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