Another possibility would be to talk about a few unsolved problems in mathematics. It's easy for kids to think of math as a "finished" edifice, compared to fields like biology and physics where we hear about new discoveries frequently; seeing some unsolved problems can make it more exciting. I think this recent book does a good job explaining some unsolved problems accessibly, and at least some of them even a 9-year-old should be able to understand.
Mike Shulman
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