The practical figurer [electronic resource] : or, an improved system of arithmetic. Containing, A large Exemplification of the several Rules in common Arithmetic, with the Doctrine of Vulgar and Decimal Fractions; abounding with numerous Examples, useful, subtle, and entertaining, for gaining the Attention, and improving the Genius of Youth. Many new and concise Methods for finding the Price of Goods, Interest of Money, &c. with one Rule entirely New, called Irregular Progression, never before heard of in Arithmetic. A large practical System of Algebra, containing a great variety of new and entertaining Problems, with a direct Method of solving Cubic Equations, by an easy and simple Operation. By William Halbert, Schoolmaster at Auchinleck.