Number rotator

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As transposed digits ( Austrian. Also digit fall ) refers to the interchange of two numbers (usually within) a number . Rotating numbers are a manifestation of transmission errors . Comparable transmission errors are reversed letters (e.g. Auguts instead of August).


  • The year 1946 instead of 1964
  • 554 kg instead of 545 kg of steel
  • Price for a product 69 euros instead of 96 euros

Check digits can be used to avoid number rotations and other transmission errors . In the case of bank transfers, for example, the IBAN DE 68 5206 0410 0000 5052 02 with rotated digits is recognized as incorrect using the check digits 68 .

One method for checking invoices (not only) for rotated numbers is the penalty test . If there are two different results when adding or subtracting numbers and the difference is divisible by 9, this indicates that one of the added or subtracted numbers has rotated.

Bit errors are a related problem in computer science .

German language

Some authors argue that number rotations occur particularly in the German, Dutch and Danish languages, since the hundreds are mentioned first, then the ones and finally the tens. According to this opinion, changing the German language could reduce the number of rotators.

Web links

Wiktionary: Number rotator  - explanations of meanings, word origins, synonyms, translations
  • No more rotating numbers? How to prevent the German language from changing numbers. Article by a Bochum mathematician in the online magazine Die Zeit on January 22, 2004.

Individual evidence

  1. Manfred Hauenschild: "Twenty One". .: For the correct way of speaking numbers. Facts, Arguments, Opinions, 2008, ISBN 3819607013 , p. 55 ff., Online