Answer
Success!
Digit Sum = 6
Reduced Digit Sum = 6
↓Steps Explained:↓
Calculate the digit sum of 15
Calculate the reduced digit sum of 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 = 6
Reduced Digit Sum = 6
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1089 Number Trick