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A digit sum calculator adds together all the individual digits of a number. The sum of digits of 12345 is 1+2+3+4+5 = 15. Digit sums are used in divisibility rules (a number is divisible by 9 if its digit sum is divisible by 9), check digit algorithms, and computing digital roots.

Formule

Stapsgewijze handleiding

1. 1Separate the number into individual digits
2. 2Add all digits together
3. 3The result is the digit sum

Uitgewerkte voorbeelden

Veelgemaakte fouten om te vermijden

• ✕Including the decimal point in multi-digit sums
• ✕Forgetting negative signs don't affect digit sums