🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoPolskiPortuguêsРусскийفارسی中文EntityQ71746· pop 14· linked from 78 articlesTrachtenberg systemsystem of rapid mental calculationWikidata factsImage2FingerMethod-third digit.pngSources (1)wikidata.orgvia Wikidata · CC0Available in 14 languagesEspañolFrançaisDeutschРусскийPortuguêsItalianoBahasa IndonesiaBanglaEsperantoPolskiConnectionsdivision algorithmEntitymultiplication algorithmEntityCategoriesArithmeticMental calculation