The Schoolmaster's most useful companion, and scholar's best instructor in the knowledge of arithmetic [electronic resource] : In two parts, viz. Part I. Containing the first Principles of Arithmetic with plain and concise Directions to work the following Rules: viz. Addition, Subtraction, Multiplication, Division, Reduction, the Rules of Three, Interest, Alligation, Fellowship or Partnership, Rebate, Progression, Vulgar and Decimal Fractions, Extraction and Use of the Square and Cube Roots. With a Variety of practical Questions to exercise all the foregoing Rules, each having the Answer inserted, in order to save the Master or Tutor a great deal of Time and Labour, and help the Scholar forward in his Progress in the practical Part of Arithmetic. Part II. A very Short and Easy Sketch of Book-Keeping, by Way of Common Debtor and Creditor only; by which accompts may be kept with great Ease and Exactness. To which is added, an appendix. Containing Rules for the true performing of Cross Multiplication, and the same reduced to actual Practice in Measuring Carpenters, Joiners, Paviors, Thatchers and Bricklayer's Work; as also how to gauge Coolers, Cisterns and Casks in Wine, Ale Gallons and Malt Bushels, both by the Pen and sliding Rule. The Whole digested in such a Manner as to render it not only useful in almost every Branch of Life and Business, but very entertaining. Recommended by several eminent Masters and others, for the Use of Schools, &c. By D. Fenning, Author of the Royal English Dictionary, Young Man's Book of Knowledge, New Treatise on the Use of the Globes, Universal Spelling Book, &c. .