Here's a good slide to show to start a conversation about decimals with your class. The first question that comes to my mind is: So, really, how big is this gorilla? What are some of the questions that come to your mind?Most textbookish review sections for decimals are pretty boring. How might this help? Putting a common idea in a interesting, surprising way will get the kids attention. Now how do achieve your math objective with that?
Source: Wired Magazine (Nov. 2009) p. 45. I had to scan it; couldn't find it on the Web.)
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