The accomptant's companion [electronic resource] : or, the young arithmetician's guide. Being an easy introduction to arithmetic, in Whose Numbers, and Fractions, Vulgar and Decimal, each Rule exemplified by a Number of Questions to make the whole plain and familiar; Extraction of the Square and Cube Roots, and their Application to Use, Interest, Simple and Compound, Annuities, Rebate, and Equation of Payments, a Collection of Questions with their Answers. Serving to Illustrate all the Rules; with Variety of Bills of Parcels, &c. to qualify Youth for Trade and Business: To which is added, an appendix of cross multiplication, applied to mensuration, as used by different Artificers. The Whole Designed for the Use of Schools, and is recommended by several Eminent Mathematicians and School-Masters. By Thomas Harper, Master of the Academy in Harley-Street, Cavendish Square.