Enter Number

Calculate the digit sum of 78

Calculate the reduced digit sum of 78

Add up 2 digits of 78:

Digit Sum → 7 + 8 = 15

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 15

Add up 2 digits of 15:

Digit Sum → 1 + 5 = 6

Since our digit sum ≤ 9:
we have our reduced digit sum

Final Answer


Digit Sum = 15
Reduced Digit Sum = 6