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Cannon, L., Heal, R. & Wellman, R. (2000). Serendipity in Interactive Mathematics: Virtual (Electronic) Manipulatives for Learning Elementary Mathematics. In D. Willis, J. Price & J. Willis (Eds.), Proceedings of SITE 2000--Society for Information Technology & Teacher Education International Conference (pp. 1083-1088). Chesapeake, VA: Association for the Advancement of Computing in Education (AACE).