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Saxe, G., Shaughnessy, M., Earnest, D., Creamer, S., Sitabkhan, Y., Platas, Y., & Young, A. (2007). Fractions on the number line: A comparative analysis of the travel of ideas. In Proceedings of the 29th annual meeting of the North American chapter of the international group for the Psychology of mathematics education (pp. 18 - 20)