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cast out nines. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Verb
cast out nines (third-person singular simple present casts out nines, present participle casting out nines, simple past and past participle cast out nines)
- (arithmetic) To apply a procedure for verifying whether an arithmetic operation is probably correct or certainly incorrect using modulo characteristics of the digit 9.
Translations
verification of an arithmetic operation
Further reading