[Free Registration/Login Required] An article outlining a PBL unit taught in an eighth grade history class. The educator discusses how the unit was developed by accident and how he drew on the students interest to make it successful!

The goal of this lesson is for middle schoolers to use manipulatives to add integers, creating concepts rather than memorizing rules. This lesson will be related to the 300 Spartans who battled the invading Persians at the Battle of...