The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1089.
1089 has 4 digits. The digits in 1089 are 1, 0, 8, and 9.
When you are asking for the sum of the digits of 1089, you are basically asking what is
1 plus 0 plus 8 plus 9?
Therefore, the sum of the digits in 1089 is as follows:
1 + 0 + 8 + 9 = 18
Sum of digits in 1090
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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