The practical arithmetician: or Art of numbers improved. [electronic resource] : Exhibiting a new method of learning the most useful branches of arithmetic, perfectly, in the shortest time; by a succession of plain, easy, short, improved, mechanical, and direct, rules. For the use of schools and private tutors. Without the great hindrance and loss of time to learners, by being put backward and forward under different instructors. Since the first small work was proposed, at a small price, the work is enlarged and improved into a complete treatise on all the useful and curious subjects of arithmetic, to make it a most perfect work of its kind. By the Palladium-Author, junior.