Development of "Concrete" Educational Materials for Mathematics on Tablet PCs

The educational materials for mathematics were developed on tablet PC. By corresponding the proper user interface of tablet PC to mathematical operation in the materials, students can operate equations and figure by their fingers intuitively. As the result of this operation, they treat mathematics as a "concrete" substance. The "concreteness" means direct visualization due to the operations. We exemplifies the application of the interface for algebra and geometry.