The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 420.
420 has 3 digits. The digits in 420 are 4, 2, and 0.
When you are asking for the sum of the digits of 420, you are basically asking what is
4 plus 2 plus 0?
Therefore, the sum of the digits in 420 is as follows:
4 + 2 + 0 = 6
Sum of digits in 421
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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