Arithmetic made easy, [electronic resource] : in the first four fundamental rules, with an appendix of reduction and the single rule of three. Also a collection of all the useful tables. Submitted to the earliest and least informed Capacities, and principally designed to revive the neglected, but useful Exercises of that Science. To which are added for Illustration, Examples and Proofs under every rule; also For Exercise, many Examples and their Answers under every Case in Reduction and the Rule of Three. Upon an intire new plan. By J. Bettesworth, Mathematical Master to the Maritime School, Chelsea.