How to not teach

To do my own research on not to teach, I came across this article and I found it interesting – The author says “It was not a good idea to tell students that “multiplication is repeated addition”. Explore WHY……. http://www.maa.org/devlin/devlin_01_11.html
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You may like this article to do some kind of brain storming ormay like to read this just for fun and a different perspective 🙂