This lesson can only be used on a Promethean Interactive Whiteboard. You must own the ActivInsnpire Software.
This lesson introduces students to using indirect reasoning when putting a proof together. The Do Now engages the students in solving a magic square. A magic square template is included in the zip folder. You can use this is a communicator clearboard available from Educator's Outlet or students can write on the magic square directly. The magic square is used as the starting place to think about how indirect reasoning can be used.