How do prospective elementary school teachers attend to, interpret, and decide based on children’s algebraic thinking? The case of numerical equalities

In this research, we explore how a group of 21 future primary school teachers attend to, interpret, and make decisions based on the algebraic thinking demonstrated by girls when solving numerical equalities. We adopt the conceptual perspectives of Noticing and MTSK to deepen the participants' professional knowledge. The future teachers participated in a course on teaching and learning school algebra, which followed a video analysis methodology. The main results show that the participants consider the algebraic elements involved in the situation, although the use of evidence is limited. Additionally, we highlight the mobilization of various mathematical knowledge for teaching school algebra