The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2099.
2099 has 4 digits. The digits in 2099 are 2, 0, 9, and 9.
When you are asking for the sum of the digits of 2099, you are basically asking what is
2 plus 0 plus 9 plus 9?
Therefore, the sum of the digits in 2099 is as follows:
2 + 0 + 9 + 9 = 20
Sum of digits in 2100
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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