@article {1317, title = {TEACHERS{\textquoteright} AWARENESS AND UNDERSTANDING OF STUDENTS{\textquoteright} CONTENT KNOWLEDGE OF GEOMETRIC SHAPES}, journal = {Problems of Education in the 21st Century}, volume = {78}, year = {2020}, month = {October/2020}, pages = {Continuous}, type = {Original article}, chapter = {777-798}, abstract = {Few research studies have been conducted in a primary school in early mathematical education about the teaching of geometry. This research aims to contribute with knowledge of how teachers{\textquoteright} awareness and understanding of necessary conditions to enhance students{\textquoteright} abilities to discern two- and three-dimensional shapes develop. In this research, qualitative methods were used to analyse data from a lesson study in grade 4 in the subject of mathematics. Data were primarily collected through audio-recorded conversations with teachers before and after the lesson, and the results of students{\textquoteright} pre- and post-test. The results of this research showed increased awareness of using collaboration opportunities to apply professional classroom instructions and activities to enhance students{\textquoteright} knowledge of two- and three-dimensional shapes. This research elucidates how the practice-based professional development approach emphasised the teachers{\textquoteright} teaching targets for understanding students{\textquoteright} content knowledge of geometric shapes. Additionally, the result highlighted teachers{\textquoteright} awareness and understanding of the challenges students face in learning about three-dimensional shapes from two-dimensional representations. Future research should develop a more iterative and revised research lesson design to develop more powerful content knowledge and classroom activity in this topic area. }, keywords = {early mathematics education, geometric shapes, lesson study, practice-based professional development}, issn = {1822-7864}, doi = {https://doi.org/10.33225/pec/20.78.777}, url = {http://oaji.net/articles/2020/457-1600951875.pdf}, author = {Balli Lelinge and Christina Svensson} }