This is not necessarily the most exciting of topics, but I do think that Venn Diagrams are incredibly useful ways to represent/visualize certain numerical situations. I've created a simple template with a variety of Venn Diagram configurations (though certainly not every possible one!).
In the video below I take the existing template (which I created) and unlock, duplicate, and change color properties for one of the circles and attempt to make a quadruple-circle diagram. That's a challenge in and of itself!
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TEDxNYED: About Assessment