The aim of the first part of the project is to introduce secondary school students to the basics of fractional calculation using a digital learning environment. For this we use the digital learning environment ALICE. Mathematics students for teaching posts at grammar schools supervise the pupils in learning the concept of fractions. These students should not only try out a teaching method, but also gain social experience. This project also serves to introduce prospective teachers to the practice of computer-aided education. Not only can they test and refine their teaching methods, but they can also gain valuable didactic, pedagogical and social experience in the support and support of underperforming students.

However, learning effects with digital media depend not only on the quality of the digital medium, but also on the type of use in the classroom. However, the specific way in which digital media are used has hardly been examined from a mathematics didactic perspective. The aim of the second part of the funding and research project is to characterize the actions of the teachers when using the digital learning environment ALICE in mathematics lessons and to relate the specific teaching activities of the teachers to aspects of their professional knowledge. The study aims to contribute to a better understanding of the use of digital media and to answer the question of how teachers can use digital media effectively in mathematics lessons.