Calculate the digit sum of 99

Calculate the reduced digit sum of 99

Add up 2 digits of 99:

Digit Sum → 9 + 9 = 18

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 18

Add up 2 digits of 18:

Digit Sum → 1 + 8 = 9

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

Final Answer


Digit Sum = 18
Reduced Digit Sum = 9


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What is the Answer?
Digit Sum = 18
Reduced Digit Sum = 9
How does the Digit Sum Calculator work?
Free Digit Sum Calculator - Calculates a digit sum and reduced digit sum for a number.
This calculator has 1 input.
What 1 formula is used for the Digit Sum Calculator?
Add the digits together to get a sum. If the sum is greater than 10, keep adding the digits of the new sum until the sum is less than 10.
What 3 concepts are covered in the Digit Sum Calculator?
digit
Any of the numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) used to construct a number
digit sum
Adding the digits of a number and repeating the process of the sum until the final sum is less than 10
sum
the total amount resulting from the addition of two or more numbers, amounts, or items
Example calculations for the Digit Sum Calculator
  1. Digit Sum of 2
  2. Digit Sum of 3
  3. Digit Sum of 4
  4. Digit Sum of 5
  5. Digit Sum of 6
  6. Digit Sum of 7
  7. Digit Sum of 8
  8. Digit Sum of 9
  9. Digit Sum of 10
  10. Digit Sum of 11
  11. Digit Sum of 12
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  17. Digit Sum of 18
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