Second edition of this rare Spanish handbook of arithmetic, first published in 1699. The appendix, beginning with page 470, contains chapters on guessing numbers someone else has imagined, numerological entertainments inspired by Kabbalah, geometric calculations, musical intervals, and music theory. Juan Bautista Corachan (1661-1741) of Valencia was appointed professor of mathematics at the University of his hometown in 1696, and participated in the scientific salons of the city at the turn of the 17th and 18th century. He is the author of a number of books aiming at popularizing the sciences.