Develop mathematical knowledge by analyzing common student errors and discussing arithmetic, algebraic, and pictorial reasoning.

Contributor Notes

Jane-Jane Lo,, is an associate professor at Western Michigan University in Kalamazoo. She is interested in supporting sense-making activities at all levels.

Yi-Yin Ko,, teaches prospective elementary and secondary teachers at Indiana State University in Terre Haute. She is interested in the teaching and learning of algebra, generalization, justification, and proof.

(Corresponding author is Lo author is Ko
Mathematics Teaching in the Middle School


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