The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1644.
1644 has 4 digits. The digits in 1644 are 1, 6, 4, and 4.
When you are asking for the sum of the digits of 1644, you are basically asking what is
1 plus 6 plus 4 plus 4?
Therefore, the sum of the digits in 1644 is as follows:
1 + 6 + 4 + 4 = 15
Sum of digits in 1645
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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