This Instructional Activity is a part of the Lesson 7, Unit 2, Grade 6. In this activity, students draw their own double number line diagram from scratch and identify which elements are important to create a useful double number line diagram. Say: "You just used a double number line to solve some problems. Now, you'll create a double number line from scratch. Once you know how to make double number lines, you can use them for any situation with equivalent ratios." Arrange students in groups of 2.