Enter Number

Calculate the digit sum of 255

Calculate the reduced digit sum of 255

Add up 3 digits of 255:

Digit Sum → 2 + 5 + 5 = 12

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 12

Add up 2 digits of 12:

Digit Sum → 1 + 2 = 3

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

Final Answer


Digit Sum = 12
Reduced Digit Sum = 3