The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 129.
129 has 3 digits. The digits in 129 are 1, 2, and 9.
When you are asking for the sum of the digits of 129, you are basically asking what is
1 plus 2 plus 9?
Therefore, the sum of the digits in 129 is as follows:
1 + 2 + 9 = 12
Sum of digits in 130
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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