Meaning of “mental arithmetic” in the English Dictionary

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"mental arithmetic" in British English

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mental arithmeticnoun [ U ]

uk /ˌmen.təl əˈrɪθ.mə.tɪk/ us /ˌmen.t̬əl əˈrɪθ.mə.t̬ɪk/

calculations that you do in your mind, without writing down any numbers

(Definition of “mental arithmetic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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