The workbook 2 from "Welt der Zahl" offers 80 pages of in-depth, self-explanatory exercises as a supplement to the tasks in textbook 2. 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 feature QR codes, which provide quick and easy access to explanatory videos as well as additional digital exercises. Solutions to the workbook can be found either in print form together 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 challenge workbook, which is also tailored to the textbook and workbook, is advisable.