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Chandra Orrill from UMass-Dartmouth and the Kaput Center discusses the article, "Making sense of double number lines in professional development: Exploring teachers\' understandings of proportional relationships," from the Journal of Mathematics Teacher Education. (Co-author: Rachael Brown) link to article

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• Chandra\'s Professional Website
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• InterMath Project Website
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See the comments for references mentioned in the interview.