It is not always easy to conduct contemporary, high-quality mathematics instruction that takes into account not only content-related mathematical competencies but also process-related competencies, while allowing children to work actively and exploratively at their own level. You are certainly familiar with the challenge of selecting the right tasks and adapting the instruction to your heterogeneous student body. With this volume, the long search for suitable tasks comes to an end: it offers you excellent tasks covering all competency areas for the combined grade level 3/4, making individual support and natural differentiation simple and achievable. The lesson plans for the tasks provide you with quick and straightforward lesson planning without extensive preparation, along with practical worksheets and the motivational character Professor Knob.