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YONKERS-ON-HUDSON, NEW YORK
WORLD BOOK COMPANY

AND MANILA

1914

PHILIPPINE EDUCATION SERIES

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PHILIPPINE INDUSTRIAL ARITHMETICS

PRIMARY ARITHMETIC: Parts I and II. Revised Edition

By Mabel Bonsall. Cloth, 152 pages. Illustrated in colors. Reviews
first-year numbers and completes the work of the second year of the pri-
mary cour:

urse. The revised edition gives extensive drill, uses familiar ma-
terial in a large and varied supply of problems, and furnishes copious
suggestions for seat work.

PRIMARY ARITHMETIC: Part III. Revised Edition

By Mabel Bonsall and GEORGE E. Mercer. Cloth, 200 pages.
Illustrated. The revised edition rounds out the work of the primary
grades and prepares for intermediate work. Agricultural and other in-
dustrial problems touching the genuine interests of pupils, and postal

savings bank exercises, are unique features of this book.
INTERMEDIATE ARITHMETIC: Part I. Revised Edition

By George E. MERCER and Mabel Bonsall. Cloth, 168 pages.
Illustrated. This book is designed for use in the fifth grade. It reviews
fundamental operations, presents the essentials of common fractions,
decimals, the metric system and percentage, and gives correct ideas

of business practice.
INTERMEDIATE ARITHMETIC: Pts. II and III. Rev. Ed.

BY. GEORGE E. Mercer and Mabel Bonsall. Cloth, 302 pages.
Austrated. For use in the sixth and seventh grades. The metric system
.and the applications of percentage receive especial attention. Suffi-
cient:abstract work is given to lead the pupil to acquire the computing
habič. Mathematical principles are embodied in groups of instructive
Philippine problems. The exhaustive reviews are a valuable feature of
this book. Part III introduces the elements of algebra and geometry.
The pupil is familiarized with algebraic expressions and symbols, and
the solution of simple equations. Simple geometrical facts and con-
ceptions are presented as concretely as possible.

WORLD BOOK COMPANY

YONKERS-ON-HUDSON, NEW YORK

11 1 23-6

Copyright, 1907, 1909, 1913, 1914, by World Book Co.
dat Stationers' Hall, London. Registrado en las Islas Filipinas. All rights reserved

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.

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