The topic of this thesis is the use of a picture book in the math enrichment program. The theoretical part of the thesis gives an overview of the history of picture books, its roles and classification. The role and importance of picture books in teaching lower primary students are also discussed. As one of the types of picture books, a mathematical picture book is singled out and the topics of mathematical picture books are analysed. The thesis also includes an overview of the principles in teaching mathematics as well as the mathematics curriculum, with special emphasis on the first year primary school and math enrichment program. The mathematical picture book Counting Creatures, by Julia Donaldson and SharonKing Chai, was used as the basis for activities carried out within workshops for first grade students in math enrichment program. In the first phase, assignments and teaching materials were designed based on the content of the picture book Counting Creatures. Second phase consisted of workshops where students read the picture book, discussed it with a university student, and solved the given tasks. It was finished by the third phase where, according to a previously designed word assignment, students independently designed illustrations for their own mathematical picture book. Monitoring student activity through all three phases and analysing the newly created student picture book showed that the students involved were highly motivated to solve the tasks related to the mathematical picture book Counting Creatures. In addition, it showed that the newly created picture book is a high-quality mathematical picture book that can achieve numerous mathematical principles and which also satisfies various functions of a picture book. This work has also shown that it takes the creativity of teachers in the organisation of math enrichment program to interest students and further motivate them to adopt mathematical content.