New teachers can immediately begin using these classroom-tested ways to incorporate mathematical argumentation in their classrooms on a daily basis.

Contributor Notes

Melissa Graham, mgraham14@ewu.edu, is a Senior Lecturer in the Department of Mathematics at Eastern Washington University and is pursuing a PhD in mathematics and science education at Washington State University. She is interested in mathematics teacher learning and culturally responsive pedagogy.

Kristin Lesseig, kristin.lesseig@wsu.edu, is an associate professor of mathematics education at Washington State University. Her research interests revolve around justification and proof, with specific attention to professional learning experiences for preservice and in-service teachers that support their work to promote mathematical reasoning in K–12 classrooms.

(Corresponding author is Graham mgraham14@ewu.edu)
(Corresponding author is Lesseig kristin.lesseig@wsu.edu)
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