In 1484, Ratdolt published the first printed European commercial arithmetic book, *Qui comenza la nobel opera de arithmetic. *The book was written by the Venetian mathematician Piero Borghi (1424-1494) for the merchants of his city. It was one of the most important and influential mathematics books of its time. Later editions would bear the title, *Libro de abacho. *The title page of the 1550 edition of the *Abacho* is shown here.

On these pages, examples of computations involving the operations of division and multiplication are given.

*These images from its George Arthur Plimpton Collection are presented through the courtesy of the Columbia University Libraries.*

For images from an earlier edition of this text, see Mathematical Treasure: Borghi's Best Commercial Arithmetic in *Convergence*.

Index to Mathematical Treasures