The aim of the dissertation thesis is to study the non-mathematical content of textbooks of mathematics. Textbooks of mathematics are not only a pedagogical document but also a cultural artefact that is produces in a particular society with its own cultural norms. While working with a textbook of mathematics, pupils come across many images of everyday life. Yet, since the main goal of a mathematics textbook is to help pupils gain knowledge and skills in mathematics, not much attention is paid to textual (non-mathematical, cultural) content. This means that pupils almost on everyday basis visit a world that tries to awaken the illusion of being "real", of being model of reality but in fact is a model for what is perceived as normal. The question asked in the presented research is what images of everyday life pupils come across while working with Czech textbooks of mathematics and whether there are differences among textbooks by different authors in this respect. Within the frame of this research, five sets of textbooks for 6th grade of lower secondary schools and four textbooks for 9th grade (only the chapter on financial mathematics, an area closely connected to everyday life) were analysed with respect to their non-mathematical, cultural content. The method used in the research comes out of the..