References
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- National Council of Teachers of Mathematics. Principles to actions: ensuring mathematical success for all. Reston: NCTM; 2014.
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- Ohio Resource Center [Internet]. Folded Triangle [about 2 screens]. Ohio: ORC; c2015 [cited 2014]. Available from: http://www.ohiorc.org/pm/math/richproblemmath.aspx?pmrid=72