Clear Structure - Open and Teach. No surprises in the classroom: Each learning unit is structured the same way: introductory impulse, teaching text, key points, examples, tasks. This provides orientation and a quick overview for you and your classes. More tasks for practice, deepening, and networking. Tasks, tasks, tasks - this is what makes a good mathematics textbook even today. Numerous tasks for different learning levels help with practicing and securing the learning material. This way, your learners gain confidence. Differentiation at three levels. The new Lambacher Schweizer offers optimal differentiation options with its clear concept and classification into three levels. This allows you to address all learners individually in class. Independent practice and testing. Elements such as 'Test Yourself', 'Basic Knowledge', 'Review-Deepen-Network', and 'Test' help to reinforce and recap the learning material. With the accompanying solutions in the appendix, your learners can independently check their knowledge level and prepare for exams. Content: I Handling Numbers and Sizes. II Symmetry. III Calculating. IV Areas. V Rectangles and Cubes. VI Fractions - The Whole and Its Parts.