Area and perimeter are often confusing concepts to third graders who are also just learning how to multiply. This flipchart allows them to use a unit grid to determine area and perimeter, but also requires them to determine a multiplication fact which describes the area. This flipchart comes with a multiplication grid linked within in the sheet so students can quickly determine a shapes area and deduce an multiplication fact. It is also is graphical, so students have a chance to internalize the area and perimeter concepts. I use this in a computer lab where every child solves the problems, but would also be a great teaching tool on an IWB.
Here's a video description: