Answer
Digit Sum = 8
Reduced Digit Sum = 8
↓Steps Explained:↓

Calculate the digit sum of 116
Calculate the reduced digit sum of 116

Add up 3 digits of 116:
Digit Sum → 1 + 1 + 6 = 8
Since our digit sum ≤ 9:
we have our reduced digit sum
Final Answer
Digit Sum = 8
Reduced Digit Sum = 8
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1089 Number Trick