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Description: The National Council of Teachers of Mathematics (NCTM) has a plethora of resources for Math teachers but their site Illuminations, is the most appropriate to developing conceptual understanding. Illuminations has a bunch of different lesson plans, games and other interactive software that can be used to help students understand what they are learning in a deeper way. The lesson plans can only be accessed if you have a paid membership but all of the interactives are available for free.