A fun exploration for upper elementary or middle school students, from Numberphile:
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Denise Gaskins' Let's Play Math 
Thank you for sharing!
Very nice explanation. This is a topic I have seen many kids struggle with.
Very interesting! I certainly learned from your video, and that explanation will be easy for my students to understand.
Instructions are very clear and the calculator visual great!
The explanation was well done and easy for others to understand.
You are an engaging teacher. The explanation was phenomenal. My students would love it.
Thank you all for visiting! If you enjoyed this video, be sure to check out Numberphile’s main website for more fun.