The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 99.
99 has 2 digits. The digits in 99 are 9 and 9.
When you are asking for the sum of the digits of 99, you are basically asking what is
9 plus 9?
Therefore, the sum of the digits in 99 is as follows:
9 + 9 = 18
Sum of digits in 100
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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