Arithmetick in the plainest and most concise methods hitherto extant. With new improvements for the dispatch of business in all the several rules [electronic resource] : As also, fractions vulgar and decimal wrought together after a new method, that renders both easy to be understood in their nature and use. The whole perus'd and approv'd of, by the most eminent accomptants in the several offices of the revenue, viz. customs, excise, &c. as the only book of its kind, for variety of rules and brevity of work.