Multiply Through by How Much I Care
An apathetic student solves a linear equation by multiplying both sides by zero.
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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/2018-11-01-multiply-through-by-how-much-i-care/ (CC BY-NC 4.0)Transcript
[Paper: 6x + 3 = (x + 100)/11 → 0 = 0, "Answer: 0"]
Teacher: "Wait... how did you get zero equals zero?" Student: "I multiplied through by how much I care."