This listing features a 1987 teacher resource book written by Jan Fair and published by Cuisenaire. It is titled Tangram Treasury Book C and is designed for grades 5-10. The tangram is an old Chinese puzzle game consisting of seven pieces called "tans." You can buy sets of tans or you can make your own using the pattern on page 44 in this book. The pages are put in order by increasing difficulty but can be done in any order. Each page features a "challenge" activity to extend the learning and to offer opportunities for creative and mathematical explorations. Teacher pages are sprinkled throughout the book. Topics included in this book are geometric properties of polygons, concave and convex shapes, congruence and similarity, area and perimeter, Pythagorean theorem, fractions, inequalities and problem-solving. This is a valuable resource for an upper elementary, middle school or early high school math teacher or parents who homeschool their children. The book is brand new and comes from a smoke-free and pet-free home. Please check my other listings for more teacher resources. 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.