The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 5145.
5145 has 4 digits. The digits in 5145 are 5, 1, 4, and 5.
When you are asking for the sum of the digits of 5145, you are basically asking what is
5 plus 1 plus 4 plus 5?
Therefore, the sum of the digits in 5145 is as follows:
5 + 1 + 4 + 5 = 15
Sum of digits in 5146
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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