A directory of useful objects found on the web for teaching Maths.
http://illuminations.nctm.org/activity.aspx?id=3482
Interactive, Manipulative, Publisher, NCTM Illuminations
Use tiles to represent variables and constants, learn how to represent and solve algebra problems. Solve equations, substitute in variable expressions, and expand and factor.
21 June 2016 Edit: 19 June 2016
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