The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 9939.
9939 has 4 digits. The digits in 9939 are 9, 9, 3, and 9.
When you are asking for the sum of the digits of 9939, you are basically asking what is
9 plus 9 plus 3 plus 9?
Therefore, the sum of the digits in 9939 is as follows:
9 + 9 + 3 + 9 = 30
Sum of digits in 9940
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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