Concept: In a volume per subject area, the content of the two-year vocational schools is presented in a student-friendly, clear, and understandable manner. The double-sided design and color printing facilitate navigation. The new edition significantly expands the applications and includes more open tasks and project proposals. A training program with self-monitoring options has been added. Support and possible applications for the use of calculators and computers, especially spreadsheet programs, are provided. Fundamentally redesigned and more clearly structured, the new edition significantly enhances motivation once again. Essential content: percentages, interest calculation, linear equations, inequalities, systems of equations, linear and quadratic functions, powers, exponential functions, quadratic equations, geometry.