This Shrinky Dinks activity & project also includes:
Who doesn't love Shrinky Dinks projects? Use them in your math class to teach how to derive a constant of proportionality. Learners take measurements on pre-shrunk plastic forms, and after heating, measure again. They use before and after measurements to determine a ratio, with which they can predict the final size for other forms given the pre-shrinking dimensions. This well-written activity is sure to make an impression!