The goal of mathematics teaching in primary school is not just to acquire knowledge of mathematical ideas and procedures, but also to learn mathematical reasoning. While this is common knowledge, the reality in everyday primary math classrooms in Latvia is an open question. The results from recent national diagnostics give reason to re-examine common teaching practices. The aim of this study is to clarify what is happening in primary math classrooms and to understand the needs and gaps in mathematics teaching. This will serve as the basis for designing appropriate professional development for teaching mathematical reasoning. In this study researchers observed and transcribed primary math lessons. Teacher performance was appraised using “Fra...