The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 3981.
3981 has 4 digits. The digits in 3981 are 3, 9, 8, and 1.
When you are asking for the sum of the digits of 3981, you are basically asking what is
3 plus 9 plus 8 plus 1?
Therefore, the sum of the digits in 3981 is as follows:
3 + 9 + 8 + 1 = 21
Sum of digits in 3982
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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