This paper deals with the impact of openness in learning mathematics, which is often a controversial issue. The first theoretical part of the work describes and analyzes the basic concepts for open learning forms. A review of teacher-centred teaching is followed by the chapter on the evolution of open education by Maria Montessori and other noteworthy pedagogues. Today's classroom, which is significantly influenced by competencies, is then explored. Thus a range of different learning aspects have been selected, especially classroom stations, performance assessment, and the role of the teacher. The open learning forms are of great importance for education. There are a variety of alternative methods. With the aid of these methods it is possible to create a more varied lesson and improve the quality of education. This work presents just a small selection of the large amount of open learning forms. The second part of the work includes practical implementation demonstrated by the examples of station operation and thorough lesson planning, including two lessons, all materials, and evaluation forms. The work contains a fully prepared lesson plan including all materials and worksheets. Furthermore it includes six obligatory steps, three electoral stations and the expiry of the station operation. An evaluation sheet is also included, which is essential for the performance assessment. In conclusion this paper gives an overview of the possible applications and the effectiveness of open learning forms. Moreover it underlines the importance of using a variety of methods in class.