Answer
Success!
Digit Sum = 5
Reduced Digit Sum = 5
↓Steps Explained:↓
Calculate the digit sum of 5
Calculate the reduced digit sum of 5

Add up 1 digits of 5:
Digit Sum → 5 = 5
Since our digit sum ≤ 9:
we have our reduced digit sum
Final Answer
Digit Sum = 5
Reduced Digit Sum = 5
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1089 Number Trick