This activity will take at least two class periods - more if your students do not complete part of it at home. The students work alone or in groups to create a composite figure. They will fill in the table to find the total area of their drawing. Finally, they will switch with a partner to find the area of a second composite figure.
My students really like this, but it is typical for students to not complete their drawings or to have some done incorrectly. I like to have a few of my own figures on hand for the "swapping" of figures on the second day.