I don't lecture in my class a lot, but today I did.
I have an explanation for zero as an exponent that I like a lot. I've been tweaking it for a few years. It's similar to a lot of other explanations, in that it explores the patterns of powers, but there are some subtle differences that I think kids really connect with.
I've been meaning to try out the iPad app Educreations for a while, so I figured I'd record my mini-lecture as a test.
Check it out and let me know whether you can predict how I incorporate negative exponents into my next lesson!