The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1975.
1975 has 4 digits. The digits in 1975 are 1, 9, 7, and 5.
When you are asking for the sum of the digits of 1975, you are basically asking what is
1 plus 9 plus 7 plus 5?
Therefore, the sum of the digits in 1975 is as follows:
1 + 9 + 7 + 5 = 22
Sum of digits in 1976
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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