The accountant's companion: or, schoolmaster's new assistant to practical arithmetic. Wherein The Rudiments of Common Arithmetic, Vulgar and Decimal Fractions, are delivered in a new and more concise Method than hitherto published. Whereby The vulgar Error of confounding Principles together, and the diversifying them into several Rules when they are built on the same Reason, is carefully avoided. With a sufficient variety of examples, Operated in the neatest and most approved Methods. Also the Extraction and Use of the square and cube roots, &c. With their Application to various Branches of the Mathematics. Duodecimals proved by practice, &c. And applied to Work performed by Joiners, Painters, Glaziers, Paviours, &c. To which is added, a course of book-keeping by single entry; Very necessary in facilitating the Acquisition of the Italian Method, and extremely useful for many Kinds of Business in which the latter is not materially wanted. The Whole adapted to the Use of Merchants, wholesale and retail Dealers in every Branch of Business. By J. Seally, Author of the Universal Tutor; or, New English Spelling-Book and Expositor, &c. and late Master of the Academy in Bridgewater-Square, Barbican, London