The Mastermind Abacus Blog is the spot for all the latest facts, learnings, information ยป The Mastermind Abacus Blog is the spot for all the latest facts, learnings, information about Abacus, Mental Math, child development, and much more. Mastermind Abacus offers specialized brain development solutions to the student and the best business opportunity to the teachers through the Abacus E-learning Platform.