The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 5599.
5599 has 4 digits. The digits in 5599 are 5, 5, 9, and 9.
When you are asking for the sum of the digits of 5599, you are basically asking what is
5 plus 5 plus 9 plus 9?
Therefore, the sum of the digits in 5599 is as follows:
5 + 5 + 9 + 9 = 28
Sum of digits in 5600
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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