digit sum
A "digit sum" is a concept in mathematics where the digits of a number are summed to yield a single value, often used in various number theory applications.
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Definition
B2Mathematics
(technical, academic)The total obtained by adding all the digits of a number.
Example
- The digit sum of 1234 is 1 + 2 + 3 + 4 = 10.
- To find the digit sum of 567, you add 5 + 6 + 7 to get 18.
B2Mathematics
(technical, academic)The single-digit result from repeatedly summing the digits of a number until only one digit remains.
Example
- The digit sum of 987 is 9 + 8 + 7 = 24, and then 2 + 4 = 6.
- To find the digit sum of 456, first add 4 + 5 + 6 to get 15, then add 1 + 5 to get 6.
Similar
Terms that have similar or relatively close meanings to "digit sum":