I do remember memorizing times tables and thought math was boring until 8th grade.
Kerry Kuhn

Hi Kerry, thanks for sharing. I love the four 4s problem because it takes simple concepts/methods and requires students to apply them creatively. It’s also a great context for thinking about constraints.

I also have to mention that you can make 5 without the factorial:

((4 x 4) + 4)/4 …

… but the beauty of these problems is that they do not privilege individual methods (and I’m pretty sure factorial is needed for some of the larger numbers anyway :)).

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