A directory of useful objects found on the web for teaching Maths.
https://www.youtube.com/watch?v=d8TRcZklX_Q
Investigation, Publisher, Numberphile, Video, YouTube
6174 is also known as Kaprekar's Constant.
See also a more detailed exploration of 6174 on Plus Magazine.
25 October 2018 Edit: 25 October 2018
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