Mental Mathematics: A fast Arithmetics operation at the top of your head - Initiated by Trachtenberg - Couverture souple

Maleki, Mr Enayatullah

 
9781979881302: Mental Mathematics: A fast Arithmetics operation at the top of your head - Initiated by Trachtenberg

Synopsis

Mental mathematics is the process of doing basic mathematics off the top of your head, without the use of paper and pencil, or an electronic device, with the help of Mental Mathematics; you kill two birds with one stone, keep the brain fresh and sharp, and improve your math ability.

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