Kentucky Center for Mathematics http://www.kymath.org
U.S. Math Recovery Council http://www.mathrecovery.org
Everyday Mathematics http://everydaymath.uchicago.edu/educators/index.shtml
Dot Cards and Ten Frame Activities http://www.wsd1.org/PC_Math/Dot%20Card%20and%20Ten%20Frame%20Package2005.pdf
Printable Arrow Cards and Activities http://www.bsdvt.org/schools/wheeler/math/Arrow_cards.htm