A directory of useful objects found on the web for teaching Maths.
http://illuminations.nctm.org/Activity.aspx?id=3531
Interactive, Manipulative, Publisher, NCTM Illuminations
Build up to algebraic thinking by exploring this balance tool using shapes of unknown weight. Challenge yourself to find the weight of each shape in one of six built-in sets or a random set.
23 August 2016 Edit: 21 August 2016
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