This unit uses a problem solving approach and an emphasis on deep learning and deep knowledge of important mathematical content needed for teaching. The mathematical focus areas are whole numbers, measurement and space. There is a particular emphasis on preservice teachers diagnosing their own understanding of these areas and engaging in practices, discussions and their own research to broaden and deepen their understanding. The content and assessment in this unit not only support this, but also embed this understanding in realistic contexts. A consideration of the historical and cultural development of these focus areas will situate mathematics in a multicultural and global society, and will provide better understanding of the importance of mathematics as a tool in identifying power differences among socio-economic classes, and racial, ethnic and gender groups. The kinds of approaches to learning and teaching advocated for Mathematics Learning and Teaching 1 and Mathematics Learning and Teaching 2 are modelled in this unit.