Information about the title: A well-structured task apparatus trains the application of new content. Colors and symbols clearly indicate three different levels and tasks for training process-related skills. Different approaches make it easier for various learning types to get started: whether through exploring everyday and intra-mathematical questions or by reading example-related teaching texts – numbers and sizes enable all learners to understand and learn actively. Thematic pages promote networking and interdisciplinary, project-based work. Method pages train mathematical reasoning and the use of mathematical tools. Mixed exercises provide deeper insights into mathematical connections and everyday applications. A self-diagnostic test provides feedback on individual progress.