Dubbs' Complete mental arithmetic : a volume of carefully graded exercises adapted to the use of all schools
Eugene L. Dubbs, American Book Company (Publisher)
"First edition of Dubbs' work on mental arithmetic. The author states in the preface that this subject is the most important that has been taught in the schools because it develops the reasoning faculties quicker than the study of any other discipline. The work consists of a series of problems in the various subjects of primary mathematics, including the basic sections, fractions, interest, discounts and percentages, among others. These are 'carefully graded exercises adapted to the use of all schools.' All to be accomplished without pencil or paper!" -- Antiquarian bookseller's description, 2018
Textbooks
[4], 220 pages ; 19 cm
12000901