A collection of materials and resources that supplement the activities in the Teacher's Lesson Guide. This book suggests ways to reinforce, enrich, and extend, children's mathematics experience, with an emphasis on integrating mathematics into all aspects of the classroom. It reflects the philosophy that young children should have many opportunities to explore mathematical concepts through play, informal and structured interactions with adults and other children, and exposure to a variety of materials and manipulatives in a range of contexts. Choose any of the activities that appeal to you and your class.