This PDF file presents a chapter of Annual Perspectives in Mathematics 2014: Using Research to Improve Instruction in a downloadable file that preserves the design and layout of the book while allowing users to search and print selected pages.

Chapter 12: “Situating Expansions of Students’ Explanations in Discourse Contexts.” Jeffrey Choppin (University of Rochester) analyzes the expansion moves that teachers can make to build on students’ explanations in ways that invite them into the discussion. These moves are presented in a four-phase model, and examples of classroom discussions that move through these phases are provided.

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