Methods of Teaching Mental Arithmetic, and Key to the Normal Mental Arithmetic: Containing Also Many Suggestions and Methods for Arithmetical Contractions, and a Collection of Problems of an Interesting and Amusing Character, for Class Exercise
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Methods of Teaching Mental Arithmetic, and Key to the Normal Mental Arithmetic: Containing Also Many Suggestions and Methods for Arithmetical Contractions, and a Collection of Problems of an Interesting and Amusing Character, for Class Exercise
