The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 645.
645 has 3 digits. The digits in 645 are 6, 4, and 5.
When you are asking for the sum of the digits of 645, you are basically asking what is
6 plus 4 plus 5?
Therefore, the sum of the digits in 645 is as follows:
6 + 4 + 5 = 15
Sum of digits in 646
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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