The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1815.
1815 has 4 digits. The digits in 1815 are 1, 8, 1, and 5.
When you are asking for the sum of the digits of 1815, you are basically asking what is
1 plus 8 plus 1 plus 5?
Therefore, the sum of the digits in 1815 is as follows:
1 + 8 + 1 + 5 = 15
Sum of digits in 1816
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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