Foreign Algorithms from the Rich Fund of Knowledge as a Starting Point for Mathematically Productive and Emancipating Teaching in International Classes in Germany

Among ethnomathematicians, there is a consensus that mathematics is a cultural product and a universal, pan-human activity. As such, its development cannot be unilinear. For educational contexts, ethnomathematics could result in a program that transfers this view on mathematics. Moreover, another objective is the individual empowerment of the students to develop and use mathematics in an emancipatory way. This chapter discusses two teaching experiences in international classes in that spirit.