Mastermindabacus.com is the best place to learn Abacus. We offer a complete math curriculum emphasizing critical thinking, problem-solving, and lifelong learning. For more details, visit our website. The Mastermind Abacus course structure is easy to learn and understand. Children enjoy the numerous Math Games. These keep them engaged and interested throughout the course. The course structure is the same for both an offline & online Abacus Class.