The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 309.
309 has 3 digits. The digits in 309 are 3, 0, and 9.
When you are asking for the sum of the digits of 309, you are basically asking what is
3 plus 0 plus 9?
Therefore, the sum of the digits in 309 is as follows:
3 + 0 + 9 = 12
Sum of digits in 310
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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