""The Elements, Analysis And Practice Of Arithmetic: Vulgar, Decimal, And Duodecimal, In All The Parts Of Modern Business, Mercantile Or Mechanical"" is a book written by William Gordon in 1771. This book is a comprehensive guide to arithmetic, covering three different systems: vulgar, decimal, and duodecimal. It is intended for use in all aspects of modern business, including mercantile and mechanical industries. The book begins with an introduction...