Concept: In one volume per subject area, the content of the two-year vocational schools is presented clearly and understandably, making it suitable for students. The double-sided layout and colored printing facilitate orientation. The new edition significantly expands the applications and includes more open tasks and project proposals. A training program with self-assessment options has been added. Guidance and potential applications for the use of calculators and computers (especially spreadsheet programs) are provided. Fundamentally redesigned and more clearly structured, the new version greatly enhances motivation once again. Key content: percentages, interest calculation, linear equations, inequalities, systems of equations, linear and quadratic functions, powers, exponential functions, quadratic equations, geometry.