Grades 3 - 5. Build 95 math and geometry models. Includes enough K'NEX parts to support 12-16 students working in teams of 3-4. Includes four building instruction booklets that include angles, polygons, prisms, pyramids, cubes, fraction models, area and perimeter, and more! Teacher's guide aligned to NCTM standards for grades 3-5 included. Packaged in storage tray with lid.