Four Negatives
Text only: the rule 'two negatives make a positive' crossed out, and replaced by a sentence with four negatives that carefully says 'non-negative.'
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-06-25-four-negatives/ (CC BY-NC 4.0)Transcript
[Crossed out] "Two negatives make a positive" | [Checked] "Four negatives don't fail to make a non-negative"