This series of Mathematics has been prepared in ten parts covering the syllabus upto middle classes. Two books–Introductory A and Introductory B are meant for pre-school. The authors have tried to explain the basic concepts of mathematics in easy to understand language. Examples from daily life have been taken to make those concepts clear. Up to part II, i.e., up to class II, the books have been made activity based and printed in multicolour.