PHILIPPINE EDUCATION SERIES PHILIPPINE INDUSTRIAL ARITHMETICS PRIMARY ARITHMETIC: Parts I and II. Revised Edition By Mabel Bonsall. Cloth, 152 pages. Illustrated in colors. Reviews urse. The revised edition gives extensive drill, uses familiar ma- PRIMARY ARITHMETIC: Part III. Revised Edition By Mabel Bonsall and GEORGE E. Mercer. Cloth, 200 pages. savings bank exercises, are unique features of this book. By George E. MERCER and Mabel Bonsall. Cloth, 168 pages. of business practice. BY. GEORGE E. Mercer and Mabel Bonsall. Cloth, 302 pages. WORLD BOOK COMPANY YONKERS-ON-HUDSON, NEW YORK 11 1 23-6 Copyright, 1907, 1909, 1913, 1914, by World Book Co. PREFACE THE Mercer-Bonsall Intermediate Arithmetic, in two books, follows the Bonsall-Mercer Primary Arithmetic, Part III, and is designed for the three years of the intermediate course; Part I covers the arithmetic work for the fifth grade, and Parts II and III, in one book, cover the work for the sixth and seventh grades, respectively. Part II offers a brief review of the fundamental operations, gives the final treatment to common fractions, decimals, the metric system, longitude and time, and most of the applications of percentage, and places particular emphasis upon the subject of practical measurements and the plan and purpose of the Postal Savings Bank system. Part III presents practical short methods of computation, gives adequate treatment to such applications of percentage as do not appear in Part II, and introduces ratio and proportion, powers and roots, and the measurements of the simple solids. Much time and energy have been expended in gathering reliable information concerning the business customs and industries of the Philippines. This information has furnished rich material from which a wide variety of practical and interesting problems have been made. The plan adopted in the preceding books of this series, of presenting essential facts in clear and concise form, has been followed in the present volume. iii For helpful suggestions the authors are indebted to the following superintendents and teachers of Philippine experience: Supt. E. R. Hay, Mr. Graham Kemper, Miss V. Louise Herrick, Supt. W. K. Bachelder, Mr. W. I. Chapman, Supt. H. A. Bordner, Mr. Peyton Carter, and Mrs. Emma Weston. Thanks are due also to Mr. Benjamin F. Wright of the Bureau of Posts. |