The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 400.
400 has 3 digits. The digits in 400 are 4, 0, and 0.
When you are asking for the sum of the digits of 400, you are basically asking what is
4 plus 0 plus 0?
Therefore, the sum of the digits in 400 is as follows:
4 + 0 + 0 = 4
Sum of digits in 401
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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