Answer
Success!
Digit Sum = 9
Reduced Digit Sum = 9
Reduced Digit Sum = 9
↓Steps Explained:↓
Calculate the digit sum of 90
Calculate the reduced digit sum of 90
Add up 2 digits of 90:
Digit Sum → 9 + 0 = 9
Since our digit sum ≤ 9:
we have our reduced digit sum
Final Answer
Digit Sum = 9Reduced Digit Sum = 9
Take the Quiz
Related Calculators: Factorization | Number Information | 1089 Number Trick