Enjoy these resources to one of my favorite Montessori materials! http://www.wikisori.org/index.php/Trinomial_Cube http://www.shop.montessoriprintshop.com/Binomial-and-Trinomial-Control-Cards-SenF-16.htm http://www.montessoriforeveryone.com/Binomial-Cube-Cards-Equations_p_120.html http://donnamarie.wordpress.com/2007/06/25/making-a-binomial-and-trinomial-cube/ http://www.montessoriworld.org/sensfile/sbinoml.html http://www.infomontessori.com/sensorial/visual-sense-binomial-cube.htm http://montessorimuddle.org/2012/02/02/using-the-binomial-cube-in-algebra/