Information about the title: child-friendly language models, systematic development of mathematical terminology, clear explanation phases for introducing new content, carefully formulated mathematical tasks that take linguistic stumbling blocks into account, extensive information on these stumbling blocks. Information about the series: Language plays a central role in conveying mathematical content. For children with a non-German native language or those in need of additional language support, this is often the cause of seemingly mathematical problems. In conjunction with der-die-das, eins-zwei-drei responds consistently to this issue as the first teaching material: It combines mathematical content with systematic language support, ensuring that all children meet the educational standards in mathematics. To achieve this, eins-zwei-drei offers child-friendly language models, systematic.