This is a MUST HAVE for your grade one or two classroom. The concept of place value is difficult to teach, and this unit, meant to be used over the period of about 2-4 weeks is essential. What I have done is take the activities presented in the book cited and created a SmartBoard "Go-Along." It is highly recommended that you seek out this book to read more in-depth about the lessons and activites presented. However, if you do not have access to the book, the presentation is fine as a stand a