This listing features a 2009 AIMS Education Foundation book titled Positive vs. Negative: Investigations with Integers for grades 6-9. The book also comes with a disk. The book provides hands-on experiences to develop a meaningful understanding of integers and operations on integers. Often baffled by the outcomes of integer operations, students are invited to actively explore and develop a meaningful understanding through the investigations in this book. Eight engaging integer models investigated in the book provide students with multiple experiences to develop their understanding. Several games are provided for students to practice as a class, in small groups, or alone. This is a valuable resource for middle school teachers or parents who homeschool their children. The book is brand new and comes from a smoke-free and pet-free home. There is no writing in the book. Please check my other listings for more teacher resource books. I always describe the item to the best of my ability and will point out any flaws that the item may have. I do not accept returns so please feel free to e-mail me a question before purchasing the item if you are unsure about something. You are buying the item as described. If you purchase more than one item from me, please contact me regarding combined shipping discounts. If possible, I will gladly package items together and pass along the savings to you. Let me know which items you are interested in as well as your shipping zip code so that I can notify you of the combined shipping cost. After purchasing the items, you will need to request an invoice from me so that I can adjust the shipping total for you.