This book contains a collection of division lessons that support curriculum and instruction. It is expected that 3rd and 4th grade students will establish a firm foundation of understanding and skills in division. The lessons address broader goals of division instruction and are aimed at supporting students' growth toward proficiency based on understanding. In order to help teachers with planning and teaching the lessons, each lesson is organized into sections that include an overview, materials, time, teaching directions, teaching notes, a vignette describing the actual lesson, follow-up suggestions, and questions and discussion. (KHR)