The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1964.
1964 has 4 digits. The digits in 1964 are 1, 9, 6, and 4.
When you are asking for the sum of the digits of 1964, you are basically asking what is
1 plus 9 plus 6 plus 4?
Therefore, the sum of the digits in 1964 is as follows:
1 + 9 + 6 + 4 = 20
Sum of digits in 1965
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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