Thanks to Joel's promotion of the 52 Teachers, 52 Lessons project over at So You Want to Teach?, I received this cool interactive presentation/lesson idea about significant figures. This is definitely the first chemistry lesson I've shared, but since many teachers come here searching for lessons based on the 5E instructional model, it should be very helpful to a lot of people.
Thanks to Virginia, who teaches Chemistry, Physics and Honors Chemistry in Texas for sharing.