Here, mathematics is applied in real-life contexts: Whether the trainee at the bank is calculating compound interest, the aspiring car salesman is determining the effective interest rate, or the apprentice in a pharmacy is preparing tea in a specific mixing ratio – students reinforce their knowledge in percentage and interest calculations as well as in area and volume calculations. They also create diagrams and utilize the Pythagorean theorem. At the same time, they get to know various professional fields. Thus, these exercises are also ideal as preparation for internships. The interconnection of different subject areas in the individual tasks also reflects the concept of a spiral curriculum. Additionally, important basic mathematical skills are practiced and reinforced at the end of each unit with "Train your Brain" tasks.