The workbook "Mathematics New Paths SI 9" is a comprehensive learning resource specifically designed for secondary education level 1 in Lower Saxony. The 9th edition from 2015 offers students a structured and engaging way to learn and deepen their understanding of mathematical concepts. With a hardcover and a variety of exercises, the book supports the development of mathematical skills and encourages independent learning. The content is clearly organized, allowing for a gradual approach to complex topics, making it a valuable companion in mathematics classes. The authorship, consisting of experienced professionals, ensures high-quality content and a pedagogically sound presentation.