Play-Doh is one of our favourite childhood toys. It's fun, safe and helps teach students - young and old - how to make 2D shapes, 3D solids, and even full structures.
When blogger sherioffy (that's her WordPress username) attended a conference featuring speaker Marsha Scott of the University of Texas, she was blown away. Marsha had developed lessons using only Play-Doh to teach both elementary ideas like defining a segment versus a line and complicated concepts such as the area of parallelograms and circle.
Here's an example of one of Marsha's lessons.
For all of the lessons (in PowerPoint form) check out sherioffy's blog post here!