Set Theory

I just completed a lesson with my 1st period class on the cardinality of the intersection of sets. This is not something in my course of study, but I thought it would be a great activity for a day when many of my kids were on a field trip. It was amazing how well a student in my 7th grade class did. She represented the cardinality accurately for two sets and three with no prior experience with sets besides yesterdays lesson involving intersections, unions, and subtraction. I challenged her to show me the equation for the cardinality of the intersection of 4 sets in attempt for her to find a pattern in these formulas. I love it when kids climb farther than what I anticipate.

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