This Instructional Activity is a part of the Lesson 21, Unit 6, Grade 7. Students increase the dimensions of several squares and observe the pattern that emerges from each area model. Examine the change in dimension and area of the following square as it increases by 2 units from a side length of 4 units to a new side length of 6 units. Observe the way the area is calculated for the new square. The lengths are given in units, and the areas of the rectangles and squares are given in units squared.