This Instructional Activity is a part of the Lesson 10, Unit 6, Grade 6. In this activity students are presented with several partitioned rectangles. They identify the length and width for each rectangle, and then write expressions for the area in two different ways: first as the product of the length times the width, where one of these measurements will be expressed as a sum, and then as the sum of the areas of the smaller rectangles that make up the large rectangle. Students reason that these two expressions must be equal since they both represent the total area of the partitioned rectangle. In this way they see several examples of the distributive property.