The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 80.
80 has 2 digits. The digits in 80 are 8 and 0.
When you are asking for the sum of the digits of 80, you are basically asking what is
8 plus 0?
Therefore, the sum of the digits in 80 is as follows:
8 + 0 = 8
Sum of digits in 81
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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