The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 4125.
4125 has 4 digits. The digits in 4125 are 4, 1, 2, and 5.
When you are asking for the sum of the digits of 4125, you are basically asking what is
4 plus 1 plus 2 plus 5?
Therefore, the sum of the digits in 4125 is as follows:
4 + 1 + 2 + 5 = 12
Sum of digits in 4126
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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