The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 5211.
5211 has 4 digits. The digits in 5211 are 5, 2, 1, and 1.
When you are asking for the sum of the digits of 5211, you are basically asking what is
5 plus 2 plus 1 plus 1?
Therefore, the sum of the digits in 5211 is as follows:
5 + 2 + 1 + 1 = 9
Sum of digits in 5212
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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