Role of Abacus in Academics / Dr. Muzaffar Naznin
By Dr. Muzaffar Naznin Kolkata An abacus is also called a counting frame. It is a calculating tool which has. Been used since ancient times....
By Dr. Muzaffar Naznin Kolkata An abacus is also called a counting frame. It is a calculating tool which has. Been used since ancient times....