Arithmetic, in the plainest and most concise methods hitherto extant : with new improvements for dispatch of business in all the several rules. 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 perused and approved 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. /