The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1473.
1473 has 4 digits. The digits in 1473 are 1, 4, 7, and 3.
When you are asking for the sum of the digits of 1473, you are basically asking what is
1 plus 4 plus 7 plus 3?
Therefore, the sum of the digits in 1473 is as follows:
1 + 4 + 7 + 3 = 15
Sum of digits in 1474
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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