In this article, the authors were interested to explore how teachers can effectively facilitate classroom discussions in the ways that elicit negotiation of meaning and maximize the potential of mathematical inquiry activities. In the neriage stage, Japanese teachers encourage students to listen to other students’ ideas carefully and consider the strengths and weaknesses of different problem-solving strategies. Then the teachers facilitate discussions to co-determine which strategy is the most reasonable and efficient one. This article introduces a video-based lesson study that explored how a group of U.S. teachers could successfully implement consensus building discussions (or neriage) in their mathematics classrooms.