Digit Sum of 289

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Calculate the digit sum of 289

Calculate the reduced digit sum of 289

Add up 3 digits of 289:

Digit Sum → 2 + 8 + 9 = 19

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 19

Add up 2 digits of 19:

Digit Sum → 1 + 9 = 10

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 10

Add up 2 digits of 10:

Digit Sum → 1 + 0 = 1

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

Final Answer