Magic Rectangle

This webpage, from the Tap Into Teen Minds website, includes a lesson on sparking curiosity from multiplication to quadratic relationships. "In this 3 act math task, students watch a rectangle that is iterating between getting "shorter" and "wider", then "taller" and "thinner". This task can be helpful for building understanding and fluency in estimation, spatial reasoning, two-digit by two-digit multiplication, area of rectangles, and much more. Directions, images, and equations are provided. Task resources and the 3 Act Math Tip Sheet are available to download from the website.