H. S. HALL, M.A., FORMERLY SCHOLAR OF CHRIST'S COLLEGE, CAMBRIDGE, AND S. R. KNIGHT, B.A., M.B., Ch.B. FORMERLY SCHOLAR OF TRINITY COLLEGE, CAMBRIDGE, THIRD EDITION, REVISED AND ENLARGED. London: MACMILLAN AND CO. AND NEW YORK. 1892 [All Rights reserved.] HARVARD COLLEGE LIBRARY BY EXCHANGE FROM NEW YORK STATE LIBRARY First Edition 1888. Second Edition, revised and enlarged, 1889. Third Edition, revised and enlarged, 1892. PREFACE. In this book we have followed the same plan as in our The EXERCISES are arranged as follows: Part I. includes Decimals, Practice, Simple Proportion, and Simple Interest; Part II. takes in Compound Pro- portion, Percentages, Averages, and Proportional Parts; in Part III., Square Root, Areas, and Volumes are intro- duced; Part IV. includes Discount and Compound In- terest; Part V., Profit and Loss and Stocks; Part VI., The EXAMINATION PAPERS will be found to comprise specimens of papers set at all the most important examina- |