Sinossi
Containing several new methods of operation, and a new system of proportion. With theoretical explanations of all the principal rules. Also, a treatise on mensuration, and a brief practical system of book-keeping. This book, "A practical and theoretical system of arithmetic", by George Willson, is a replication of a book originally published before 1838. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.
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