Age: 8+ Years | Duration: 15 to 45 minutes | No. of Players: 1 to many Buy Professor Henry Flashcards and build your child’s mental math and application. These game-based flashcards have encoded answers that can only be revealed by the Magic Glass™ viewer (included). You have to see it to believe it! Professor Henry Flashcards are aligned to the learning objectives of all educational boards and perfect for mastering concepts of Grade 3 Measurements & Units. MATH IS NOW FUN - Enjoy learning and improve mathematical ability with innovative, effective and fun flashcards! DESIGNED FOR ENGAGEMENT - The Magic Glass simulates a treasure hunt for kids while the multi-format cards and colorful illustrations amplify learning! MASTER MIND - Easy for parents and educators to assign questions, to learn new concepts or revise for exams! ANYWHERE, ANYTIME - Use at home, while travelling or in class to develop Math skills. Reduce screen time and improve social interactions! Package Contents:General Flashcards: 40Application Flashcards: 10Magic Glass™ viewer: 1