Abstract
This article presents research focused on establishing ways that dialogic talk between teachers and students promotes mathematical reasoning in early years classrooms. Data are drawn from recorded and transcribed Year 1 mathematics lessons. Conversation analysis provides close examination of the talk-in-interaction practices of teachers and students and reveals how mathematical reasoning is co-produced through the turn-by-turn exchange structures between teachers and students. Analysis of selected transcripts illustrate how different teacher talk moves create a dialogic talk space that make student mathematical reasoning possible. Implications for classroom practices are made.