http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=1037
http://illuminations.nctm.org/ActivityDetail.aspx?ID=11
http://illuminations.nctm.org/ActivityDetail.aspx?ID=27
http://nlvm.usu.edu/en/nav/frames_asid_171_g_3_t_3.html?open=activities&from=category_g_3_t_3.html
Representation: Pattern Blocks (Triangles to Hexagons), Number Lines, Square, Circle
Marily Burns Library: Remainder of One
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