Digit Sum of 138

Enter Number for Digit Sum:

Calculate the digit sum and
reduced digit sum of 138

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

Digit Sum → 1 + 2 = 3

What is the Answer?

Digit Sum → 1 + 2 = 3

How does the Digit Sum Calculator work?

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.

For more math formulas, check out our Formula Dossier

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

Digit Sum Calculator Video

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