The Skeptic's Horoscope: Sagittarius
Sagittarius gets a number trick: (n² − 1)/(n − 1) − 1 always returns n.
Use this cartoon
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/2014-11-12-the-skeptic-s-horoscope--sagittarius/ (CC BY-NC 4.0)Transcript
Sagittarius: "Take a number. Square it. Subtract one. Divide by one less than your original number. Subtract one again. You should have your original number. How do I know? 'tis written in the stars!"