Lara Alcock wrote about Tilting the Classroom in the London Mathematical Society Newsletter. One of the activities she does that I don’t do but should is what I’ll call What goes in the gap? from her section on deciding. The example she gives is which symbol of Image may be NSFW.
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Clearly one can do this with many other statements not just symbolic ones
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Alcock recommends that students vote on the answers to encourage engagement and notes that sometimes multiple rounds of voting are required!