List, including Cuisinaire rods, virtual rules and virtual fractions
http://www.paec.org/fdlrstech/handouts/mathpresentation_CTG_2007.htm
Selection of the best
http://www.cited.org/index.aspx?page_id=151
Illuminations - choose by year group
http://illuminations.nctm.org/Activities.aspx?grade=1
Cuisinaire Rods
http://nrich.maths.org/4348
More complex
http://nrich.maths.org/6676
National Library of Virtual Manipulatives
http://nlvm.usu.edu/en/nav/grade_g_1.html
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