PRESIDENT, FOUNDER, AND PROPRIETOR Of sadler's bRYANT AND STRATTON AND W. R. WILL PRINCIPAL OF THE MATHEMATICAL DEPARTMENT OF SADLER'S BRYANT AND 1922 EDITION THE H. M. ROWE COMPANY +5.7879e Julie 20, 1930 HARVARD UNIVERSITY LIBRARY OF THE GRADUATE SCHOOL OF EDUCATION THE 12 BS.NO. OF EDUCATION apr1,1925 ALL RIGHTS RESERVED. Infringements will be prosecuted to the full extent of the law. Entered, according to Act of Congress, in the year 1889, by in the Office of the Librarian of Congress at Washington. Copyrighted, 1890. PREFACE. HIS book embraces all the arithmetic necessary to success in THIS business. It has been specially prepared for use in business colleges in which the average period of attendance is six months. Under the competent instruction to be found in those institutions, the essentials of arithmetic, as here presented, can be thoroughly mastered within this short period, if the student is not hampered by the study of useless theories or obsolete topics. In its treatment of arithmetical subjects which every young busi ness man must know, the book will be found unusually full, its special aim being to qualify young men in six months to handle quickly, accurately, and intelligently, the class of problems which are likely to arise in every-day business life. How well the authors have succeeded in accomplishing their purpose in the present volume, they are content to leave to the enlightened judgment of business educators, for whose benefit it is especially designed. THE AUTHORS. TO TEACHERS. To 10 secure an intelligent solution of arithmetical problems, students should become familiar with the generalizations of 52, 53, 54, and 55, relating to integers; of 113, 114, and 116, relating to common and decimal fractions; and of 213 and 214, relating to percentage and its applications. Students should be required to exhibit the application of these principles to particular problems as they are successively solved, until the general law of ncrease and decrease of numbers has been thoroughly mastered. Topical rules and special analyses are soon forgotten or inextricably blended; but the constant iteration and reiteration of a few general principles, applicable to all classes of problems, are likely to eave a clear and permanent impression. By thus generalizing many perplexing arbitrary rules into a few imple common-sense rules, many independent bases of reasoning into one common basis, it is possible for business colleges in six months to impart to their students a more thorough and enduring knowledge of arithmetic than can be taught in twice that time under the old system of presentation. |