a Key to the Introduction to the National Arithmetic: Exhibiting the Operation of the More Difficult Examples in That Work : for the Use of Teachers O
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Mental Arithmetic Upon The Inductive Plan
Being An Advanced Intellectual Course, Designed For Schools And Academies »

The National Arithmetic
On The Inductive System, Combining The Analytic And Synthetic Methods : In Which The Principle Of The Science Are Fully Explained And Illustrated : Designed ... »