The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1509.
1509 has 4 digits. The digits in 1509 are 1, 5, 0, and 9.
When you are asking for the sum of the digits of 1509, you are basically asking what is
1 plus 5 plus 0 plus 9?
Therefore, the sum of the digits in 1509 is as follows:
1 + 5 + 0 + 9 = 15
Sum of digits in 1510
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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