The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 858.
858 has 3 digits. The digits in 858 are 8, 5, and 8.
When you are asking for the sum of the digits of 858, you are basically asking what is
8 plus 5 plus 8?
Therefore, the sum of the digits in 858 is as follows:
8 + 5 + 8 = 21
Sum of digits in 859
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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