I used quilting when I taught Geometry all the itme. I put together a set of blocks for Hidden Wells and used the half squares for them to figure out the pattern! It was always fun to watch them move those pieces around and decide which way they went together. It was a real lesson in teamwork!
The kids also wanted to learn how to quilt! And they did squares and [ut stitches in a group quilt during inside recess! :D