Students who engage in mathematical arguments in classrooms take part in an important practice involving reasoning and justification. As a mathematical practice, argumentation involves using both conceptual and procedural reasoning to justify a claim. Even though argumentation can occur in discussions where one asserts and defends their claim…

This article describes a writing activity that is employed after graded exams are handed back to students. Students are asked to reflect on their performance and to demonstrate understanding of mathematics related to the exam and/or unit of instruction. The article provides examples of student writing, scoring rubrics, and suggestions for…