In Part I, the author develops a theoretical approach by applying information processing theory and Piagetian psychology to the National Council of Teachers of Mathematics’ Curriculum and Evaluation Standards for School Mathematics, which is used as a framework within which to plan mathematical activities for young children. Part II, the bulk of the book, presents the activities themselves in chapters organized around mathematical themes or topics. Children investigate such approachable concepts as Number • Measurement • Spatial relationships • Shape • Sequencing • Patterns • Mathematical language • Problem solving • with an emphasis on teaching mathematics as an integral part of an early childhood education program rather than as a set of isolated skills.