James Tanton has a great video showing the “why” behind tricky exponents, negative and fractional powers.

http://www.jamestanton.com/?p=379

I’m not the biggest fan of showing videos in class, it’s hard to judge how many students are ACTUALLY paying attention, but this is a short and quality video and pausing and having them come up with predictions really helps student engagement. Bonus, James says “thrice” and “one thirty toothed”. Students loved it.

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