The workbook "Elements of Mathematics 5" is a comprehensive teaching resource specifically designed for the G9 curriculum in Lower Saxony. It is aimed at learners who wish to deepen and solidify their mathematical skills. The workbook offers a variety of exercises and tasks that are aligned with the curriculum and promote the development of problem-solving abilities. Its clear structure and didactically prepared content support learners in understanding and applying mathematical concepts. The authors Werner Ladenthin, Matthias Lösche, and Friedrich Suhr have designed the material to be suitable for both classroom instruction and independent study. With 64 pages, the workbook provides ample space for exercises and explanations to reinforce mathematical fundamentals.