A directory of useful objects found on the web for teaching Maths.
Investigation, Publisher, NRICH
The simple, fun and quite amazing arithmetical process that always leads to 6174.
See also this video from Numberphile.
25 October 2018 Edit: 25 October 2018
User submitted, thanks to Ken Wessen
Submit a correction to this link | Help align this link to NSW Mathematics Syllabuses align this link to The Australian Curriculum
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