The Math Book 4 enables a varied and stimulating teaching experience for all children. With a focus on process-related competencies, children can build stable knowledge, particularly when exploring new topics through independent discovery of connections. The structure of the arithmetic section of "The Math Book 4 - Revised Edition" is determined by the principles of written multiplication and written division based on the properties of the place value system. In geometry, knowledge of shapes and solids is deepened and expanded to include the house of quadrilaterals. The practical math curriculum that began in the first grade concludes with the topics "Fermi problems" and "project-oriented work," ensuring that children acquire all necessary skills in mathematics by the end of the fourth grade.