The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 6543.
6543 has 4 digits. The digits in 6543 are 6, 5, 4, and 3.
When you are asking for the sum of the digits of 6543, you are basically asking what is
6 plus 5 plus 4 plus 3?
Therefore, the sum of the digits in 6543 is as follows:
6 + 5 + 4 + 3 = 18
Sum of digits in 6544
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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