The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 4872.
4872 has 4 digits. The digits in 4872 are 4, 8, 7, and 2.
When you are asking for the sum of the digits of 4872, you are basically asking what is
4 plus 8 plus 7 plus 2?
Therefore, the sum of the digits in 4872 is as follows:
4 + 8 + 7 + 2 = 21
Sum of digits in 4873
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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