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Answer
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Digit Sum = 12
Reduced Digit Sum = 3

↓Steps Explained:↓

Calculate the digit sum of 138

Calculate the reduced digit sum of 138

Digit Sum

Add up 3 digits of 138:

Digit Sum → 1 + 3 + 8 = 12

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 12

Add up 2 digits of 12:

Digit Sum → 1 + 2 = 3

Since our digit sum ≤ 9:
we have our reduced digit sum

Final Answer

Digit Sum = 12
Reduced Digit Sum = 3
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