The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 999.
999 has 3 digits. The digits in 999 are 9, 9, and 9.
When you are asking for the sum of the digits of 999, you are basically asking what is
9 plus 9 plus 9?
Therefore, the sum of the digits in 999 is as follows:
9 + 9 + 9 = 27
Sum of digits in 1000
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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