The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 7120.
7120 has 4 digits. The digits in 7120 are 7, 1, 2, and 0.
When you are asking for the sum of the digits of 7120, you are basically asking what is
7 plus 1 plus 2 plus 0?
Therefore, the sum of the digits in 7120 is as follows:
7 + 1 + 2 + 0 = 10
Sum of digits in 7121
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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