Answer
Success!
Digit Sum = 4
Reduced Digit Sum = 4
↓Steps Explained:↓
Calculate the digit sum of 4
Calculate the reduced digit sum of 4

Add up 1 digits of 4:
Digit Sum → 4 = 4
Since our digit sum ≤ 9:
we have our reduced digit sum
Final Answer
Digit Sum = 4
Reduced Digit Sum = 4
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1089 Number Trick