In this favorite lesson, students must engage in cooperative problem solving and think outside the algebra box as they work to make sense of the Purple Milk problem.

Supplementary Materials

    • Supplemental Materials (PDF 577 KB)

Contributor Notes

Kasi C. Allen,, a teacher and researcher, is an assistant professor in the Graduate School of Education and Counseling at Lewis and Clark College in Portland, Oregon.

(Corresponding author is Allen
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