I’m sure your sorting activity went well. I have a similar card matching for area between curves & found that it was a great way for students to become comfortable with the definite integral notation (even before students knew how to calculate definite integrals by hand). I started doing more card matching in Calculus last year & saw a huge difference in student scores on the exam. I don’t know what took me so long to “leave the front of the classroom behind” in calculus, as I did it in my geometry classes long ago.
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