The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1611.
1611 has 4 digits. The digits in 1611 are 1, 6, 1, and 1.
When you are asking for the sum of the digits of 1611, you are basically asking what is
1 plus 6 plus 1 plus 1?
Therefore, the sum of the digits in 1611 is as follows:
1 + 6 + 1 + 1 = 9
Sum of digits in 1612
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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