The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 663.
663 has 3 digits. The digits in 663 are 6, 6, and 3.
When you are asking for the sum of the digits of 663, you are basically asking what is
6 plus 6 plus 3?
Therefore, the sum of the digits in 663 is as follows:
6 + 6 + 3 = 15
Sum of digits in 664
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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