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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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  1. 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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