A PRIMARY ARITHMETIC NUMBER STUDIES FOR THE SECOND, THIRD, AND FOURTH GRADES BY A. R. HORNBROOK, A.M. TEACHER IN THE PUBLIC SCHOOLS OF EVANSVILLE, IND. NEW YORK .:. CINCINNATI... CHICAGO Edere T 118.98.490 HARVARD COLLEGE LIBRARY GIFT OF GINN AND COMPANY COPYRIGHT, 1898, BY A. R. HORNBROOK. PRIM. ARITH. HORNBROOK. W. P. I PREFACE THE progress of a beginner in arithmetic is of a desirable kind when it involves a succession of insights into the relations of numbers and an increase of expertness in dealing with them. It is the aim of this first book to secure these ends. Its material has been chosen with careful reference to the development of the number sense of little children as observed by the author and as reported by many other observers. It is believed that when a child realizes the meanings of the first ten number names, has learned to make combinations within 10, and is able to count to 100, he is ready to take up the first hundred as an aggregation of tens, to consider other numbers as aggregations, and to discover their relations. At that point this book begins. The use of diagrams called "number tables" as a concrete basis for the child's thinking while he is getting his first ideas of the facts of the addition and multiplication tables is a distinctive feature of the work. Children readily learn from a number table like that on page 14 such facts as "5 tens = 50." The five columns of numbers are as concrete to them as five sticks, and the figures "50" at the end of the fifth column make them much more suggestive. Much of the work given in this book would be entirely too difficult for the children for whom it is intended if it lacked the basis of the measurements of the number tables. |