Mathematics
Our online Mathematics courses—spanning elementary through high school curricula—cover a wide range of topics, from algebra and geometry to chess, and cryptology and are guided by expert instructors. You’ll join group sessions with classmates to ensure you stay on track with challenging course content. Whether you’re looking for pure math fun and enrichment, to move up the math ladder and advance your academic standing, or to train for mathematics competitions, there’s a CTY course that’s right for you.
New math enrichment courses
Explore our new math enrichment courses, including Excursions in Pre-algebra and Logic and Proofs: Fundamentals.
Uncover the exciting world of cryptology
Unlock the world of secret communication! In Cryptology: Cracking Codes you and your classmates will uncover the logic, patterns, and problem-solving strategies that drive cryptographic systems. Thorugh hands-on activities like encrypting and decrypting messages and creating your own ciphers, you’ll deepen your understanding of how cryptology has developed throughout history to shape our modern encryption systems and secure our digital world.