Apedia

N)   That Your  Without   Them Mental Arithmetic

Front (n) 
calculations
https://www.macmillandictionary.com/dictionary/british/calculation
 that you do in your 
mind
https://www.macmillandictionary.com/dictionary/british/mind_1
, without 
writing
https://www.macmillandictionary.com/dictionary/british/writing
 them down (mental)
Back mental arithmetic

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