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,, 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,, 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
(Corresponding author is Lesseig
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