In this introductory video, we make a enormous deal about the differences between units and square units in the context of measuring lengths and areas. Say, is that pronounced "form-u-lay" or "form-u-lee"? I'm not sure. Go ask Phoebe. Duration: 11:00

Let's say you had a tennis ball can containing exactly three balls. Which is greater, the height of the can or its circumference? Duration: 2:51

Here are the worked-out solutions to the Level 1, 2, and 3 square perimeter and area problems. Duration: 13:44

Mrs. Matamoros presents the worked-out solutions to the rectangle perimeter and area problems. Duration: 9:03

This video contains the worked-out solution to the first parallelogram perimeter and area problem. Find the other two in the next video. Duration: 12:28

And here are the other two worked-out solutions to the parallelogram perimeter and area problems. Duration: 13:21