The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1398.
1398 has 4 digits. The digits in 1398 are 1, 3, 9, and 8.
When you are asking for the sum of the digits of 1398, you are basically asking what is
1 plus 3 plus 9 plus 8?
Therefore, the sum of the digits in 1398 is as follows:
1 + 3 + 9 + 8 = 21
Sum of digits in 1399
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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