The workbook offers 80 pages of in-depth, self-explanatory exercises as a supplement to the tasks in the textbook. The structure and content of the workbook are closely aligned with the textbook. The level of difficulty of the tasks also corresponds to that of the textbook. Various pages of the workbook contain QR codes that allow quick and easy access to explanatory videos as well as additional digital exercises. Solutions to the workbook can be found either in print form along with the solutions of the textbook or in digital form in the BiBox. For children who require more support in mathematics, the use of the specially developed support workbook is recommended. For more advanced children, the use of the corresponding advanced workbook, which is also tailored to the textbook and workbook, is advisable.