The 4M Math Puzzles and Games set is a great way to make learning math fun. Amaze your audience with number tricks, speed calculations and funny math tricks. Math Magic from 4M contains everything you need for over 15 tricks, puzzles, and games. Made using safe and high quality materials, Math Magic Puzzles and Games will last for years. A key chain calculator is included. This item is not recommended for children under 3 years of age.