A directory of useful objects found on the web for teaching Maths.
Explanation, Publisher, TEDEd, Video, YouTube
1, 2, 3, 4, 5, 6, 7, 8, 9... and 0. With just these ten symbols, we can write any rational number imaginable. But why these particular symbols? Why ten of them? And why do we arrange them the way we do? Alessandra King gives a brief history of numerical systems.
21 January 2017 Edit: 20 January 2017
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