These 165 lessons include bulleted instructions for teaching with manipulatives to develop math understanding and problem solving skills. Each lesson includes Practice and Review activities that provide a spiraling review. The colorful Student Worktext pages are shown with answer overprint. Each chapter concludes with a Chapter Review and a Cumulative Review lesson. A Chapter Overview preceding each chapter contains a theme story about Hal and Horatio and their visits to National Parks, a chart with materials to be gathered and prepared, lesson objectives, and a bulletin board illustration and description.