The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1407.
1407 has 4 digits. The digits in 1407 are 1, 4, 0, and 7.
When you are asking for the sum of the digits of 1407, you are basically asking what is
1 plus 4 plus 0 plus 7?
Therefore, the sum of the digits in 1407 is as follows:
1 + 4 + 0 + 7 = 12
Sum of digits in 1408
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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