Puzzles from Stokes Publishing Company are math-focused manipulatives that combine problem-solving fun with interesting math concepts. PolyPackPuzzle PolyPackPlus For many years puzzle makers and students of geometry have experimented with packing a cube volume with tetrahedrons. This clever manipulative polyhedron puzzle demonstrates a solution to this problem. Includes eight pentahedrons, four irregular tetrahedrons, an octahedron, in a clear plastic cube container. Activities included. Product No. 451 \$18.95 This intriguing puzzle will fascinate students with its challenging solution. PolyPackPlus contains 21 pieces and is a bit more difficult to solve. The shapes can also be used to demonstrate the metric relationship that 1cc of volume weighs 1gm and displaces 1ml of water. Clear plastic cube contains 8 tetrahedrons, 12 irregular tetrahedrons and an octahedron. Activities included. Product No. 453 \$18.95 PolyPowerPack TetraTeaser Puzzle The newest and most challenging PolyPack puzzle. Two new pieces provide additional packing schemes and puzzle challenges that will hold students' interest. Combined with previous PolyPack puzzles, this manipulative yields even more interesting variations on packing a cube space with polyhedra. With the same specific gravity feature as PolyPackPlus puzzle. The PowerPack has 18 pieces in a clear plastic cube. With activities. Product No. 454 \$18.95 Solve this seemingly simple but tricky manipulative puzzle to create a regular tetrahedron with the four congruent shapes provided. Includes four pentahedrons packed in a soft leatherette pouch. Solution included. Product No. 452 \$5.95 Dr. Super's TRIGRAM Puzzle How many different shapes can your students create from this exciting nine-piece puzzle? Consisting of one large, three medium and five small right triangles, these trigram pieces can be arrayed to show many geometric relationships. The enclosed puzzle booklet motivates students' creativity with 75 different designs for a variety of interests: dinosaurs, aircraft, animals, people, geometric figures and more! Packed in a CD-style plastic case for easy storage. Product No. 460 \$9.95 Product No. 463 \$5.00 Puzzle Outlines (70 outlines, 8-1/2 x 11)