The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 121.
121 has 3 digits. The digits in 121 are 1, 2, and 1.
When you are asking for the sum of the digits of 121, you are basically asking what is
1 plus 2 plus 1?
Therefore, the sum of the digits in 121 is as follows:
1 + 2 + 1 = 4
Sum of digits in 122
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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