The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 21.
21 has 2 digits. The digits in 21 are 2 and 1.
When you are asking for the sum of the digits of 21, you are basically asking what is
2 plus 1?
Therefore, the sum of the digits in 21 is as follows:
2 + 1 = 3
Sum of digits in 22
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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