The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1970.
1970 has 4 digits. The digits in 1970 are 1, 9, 7, and 0.
When you are asking for the sum of the digits of 1970, you are basically asking what is
1 plus 9 plus 7 plus 0?
Therefore, the sum of the digits in 1970 is as follows:
1 + 9 + 7 + 0 = 17
Sum of digits in 1971
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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