The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 7905.
7905 has 4 digits. The digits in 7905 are 7, 9, 0, and 5.
When you are asking for the sum of the digits of 7905, you are basically asking what is
7 plus 9 plus 0 plus 5?
Therefore, the sum of the digits in 7905 is as follows:
7 + 9 + 0 + 5 = 21
Sum of digits in 7906
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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