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.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.