Abstract
This article develops three different types of student explanations and studies how teachers respond to these. The data come from five classrooms at upper grade 5-7 (ages from eleven to thirteen) where all mathematics teaching for one week was filmed. These films were transcribed and student explanations identified. Through a close inspection of these, three categories of student explanations were developed. This enabled a closer study of how teachers respond. Typically, teachers respond by pointing out important details, by moving on without further comments, or by requesting students to provide more details.
Ove Gunnar Drageset