Suitable for one-year and two-year vocational schools, this resource can be used nationwide. It conveys in a compact form all the mathematical knowledge required in the context of commercial school. The mathematical calculation methods are explained briefly and comprehensibly, with individual sub-steps deepened immediately after the explanations through exercises. At the end of each chapter, there are extensive exercises. The concluding chapter, "Tasks for repetition and exam preparation," helps students apply the learning material and prepare specifically for the final exams. Now available in a new format and four-color layout. Contents include: basic arithmetic, fractions, rule of three, percentages, industrial calculation, and more. Solutions are available separately.