The Schoolmaster's Assistant is a classic textbook on arithmetic that was widely used in American schools during the 18th and 19th centuries. Written by the English master Thomas Dilworth, it offers a comprehensive treatment of arithmetic principles as well as practical applications in business and trade. The book is divided into five parts, each of which covers a specific area of arithmetic, such as fractions, proportion, and measurement. This edition includes modern annotations and exercises that make it relevant to contemporary students of math.

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