This is a lesson I built as a demo during my travels. In it, I attempt to have students learn from each other, rather than from me writing everything on the board. The technique I am using is activating students as instructional resources. Right after I used this lesson, I described it in great detail on my blog.
Everything you need is in this word document: Multiplying Radicals Lesson
Have the students work through it in pairs. At various points, they are instructed to check in with other pairs. They will eventually create their own notes, and it concludes with an exit slip so you can see if they learned what they were supposed to learn.