The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 6660.
6660 has 4 digits. The digits in 6660 are 6, 6, 6, and 0.
When you are asking for the sum of the digits of 6660, you are basically asking what is
6 plus 6 plus 6 plus 0?
Therefore, the sum of the digits in 6660 is as follows:
6 + 6 + 6 + 0 = 18
Sum of digits in 6661
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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