A directory of useful objects found on the web for teaching Maths.
http://www.youtube.com/watch?v=NhWWgBwNEYc
Publisher, Curiosity Show, Video, YouTube
It seems like telepathy but, as Rob shows, its a bit of simple logic combined with easy mental arithmetic, but if your audience doesn't know how it's done, it is an impressive trick.
21 December 2013 Edit: 25 February 2014
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