The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 2139.
2139 has 4 digits. The digits in 2139 are 2, 1, 3, and 9.
When you are asking for the sum of the digits of 2139, you are basically asking what is
2 plus 1 plus 3 plus 9?
Therefore, the sum of the digits in 2139 is as follows:
2 + 1 + 3 + 9 = 15
Sum of digits in 2140
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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