The purpose of this study is to enhance our understanding of how students listen and attend to multiple solutions proposed by their classmates during the activity of comparison. This study examines ten consecutive lessons in each of the two eighth-grade classrooms in Tokyo that are organized in the style of "structured problem solving". Twenty-four students were asked to be video/audio recorded during the lessons and also to identify and comment on their significant classroom events in the post-lesson video-stimulated interviews. The students' comments on the situations of comparing multiple solutions were classified into five codes, which show that they listened to multiple solutions differently on the basis of their process and product in the preceding individual problem solving. Furthermore, it was found that the students' exploratory questions led them to active listening to other people, which contributed to their meaning-making activity.