Information about the series: "Math Friends" is based on the requirements of educational standards and current curricula. It combines the practical experiences of teachers with the latest findings in elementary school didactics. The concept of "Math Friends" ensures the successful development of fundamental mathematical competencies in all children. The teaching material consistently employs methods of differentiation, independent work with the help of self-assessment, and reinforcement through practice, repetition, and application. The components of "Math Friends" comprehensively cover the learning areas of arithmetic, geometry, and measurement. Practical mathematics is a constant component. Additionally, content on combinatorics and data, frequency, and probability has been included. "Math Friends" demonstrates many additional strengths: Differentiation: All tasks are divided into three levels of differentiation.