The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 489.
489 has 3 digits. The digits in 489 are 4, 8, and 9.
When you are asking for the sum of the digits of 489, you are basically asking what is
4 plus 8 plus 9?
Therefore, the sum of the digits in 489 is as follows:
4 + 8 + 9 = 21
Sum of digits in 490
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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