MATHEMATICAL TEXT-BOOKS By G. A. WENTWORTH, A.M. Mental Arithmetic. Elementary Arithmetic. Practical Arithmetic. Primary Arithmetic. Grammar School Arithmetic. High School Arithmetic. High School Arithmetic (Abridged). First Steps in Algebra. School Algebra. College Algebra. Elements of Algebra. Complete Algebra. Shorter Course in Algebra. Higher Algebra. New Plane Geometry. New Plane and Solid Geometry. Syllabus of Geometry. Geometrical Exercises. Plane and Solid Geometry and Plane Trigonometry. New Plane Trigonometry. New Plane Trigonometry, with Tables. New Plane and Spherical Trigonometry. New Plane and Spherical Trig., with Tables. New Plane and Spherical Trig., Surv., and Nav. New Plane Trig. and Surv., with Tables. New Plane and Spherical Trig., Surv., with Tables. Analytic Geometry. Q A PRACTICAL ARITHMETIC BY G. A. WENTWORTH, A.M. AUTHOR OF A SERIES OF TEXT-BOOKS IN MATHEMATICS BOSTON, U.S.A., AND LONDON The Athenæum Press 1897 HARVARD COLLEGE LIBRARY GIFT OF MISS ELLEN L. WENTWORTH MAY 8 1939 Entered, according to Act of Congress, in the year 1893, by in the Office of the Librarian of Congress, at Washington Copyright, 1897, by G. A. WENTWORTH ALL RIGHTS RESERVED PREFACE. PUPILS can be trained to logical habits of mind and stimulated to a good degree of intellectual energy by solving problems suited to their capacities. By this course they acquire practical mastery over the everyday problems of common life as well as gain the very best mental discipline. The shortest and best way of learning Arithmetic is by solving problems. The rules which this book contains are not intended to be committed to memory, but to help the pupil to neat and intelligent methods. The rules follow explanations of processes, and no rule should be considered until the process which it summarizes is thoroughly understood. Dependence upon set rules and formulas is the worst possible mental slavery. The examples are in the main new, and contain a great deal of accurate and valuable information of the latest date, while they are well-graded and progressive. This Arithmetic and the author's Elementary Arithmetic are intended for a two-book course sufficiently comprehensive to cover all the work that should be required of pupils in general. The Appendix contains subjects of value only for pupils in the States named, and other subjects of little practical value but convenient for reference. |