A Practical System of Mental Arithmetic: Or, a New and Infallible Method of Making Calculations by the Mere Action of a Thought. 1St Lond. Ed., Stereotyped

Break free from tedious pencil and paper mathematics with this revolutionary new method of performing mental arithmetic. Written by John White, this book is an essential resource for students, teachers, and anyone else looking to improve their math skills and impress their friends with lightning fast calculations.

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