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Definition of mental arithmetic noun from the Oxford Advanced Learner's Dictionary

mental arithmetic

noun

/ˌmentl əˈrɪθmətɪk/

/ˌmentl əˈrɪθmətɪk/

[uncountable]

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adding, multiplying, etc. numbers in your mind without writing anything down or using a calculator

See mental arithmetic in the Oxford Advanced American Dictionary

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