The Thinking and Calculation workbooks provide additional practice opportunities for reinforcement and homework. The task formats and topics are closely aligned with the student books and can be worked on independently by the children. A simple reference system in the table of contents helps to quickly identify suitable tasks and differentiation offers. Review sequences regularly appear in the workbooks. As an alternative to the workbooks, targeted support or enrichment books that are precisely tailored to the student books and workbooks can also be used.