The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1000.
1000 has 4 digits. The digits in 1000 are 1, 0, 0, and 0.
When you are asking for the sum of the digits of 1000, you are basically asking what is
1 plus 0 plus 0 plus 0?
Therefore, the sum of the digits in 1000 is as follows:
1 + 0 + 0 + 0 = 1
Sum of digits in 1001
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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