The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 8989.
8989 has 4 digits. The digits in 8989 are 8, 9, 8, and 9.
When you are asking for the sum of the digits of 8989, you are basically asking what is
8 plus 9 plus 8 plus 9?
Therefore, the sum of the digits in 8989 is as follows:
8 + 9 + 8 + 9 = 34
Sum of digits in 8990
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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