This Instructional Activity is a part of the Lesson 1, Unit 3, Grade 6. Have students establish elbow partners, and tell them to move their fingers along their number lines to answer the following set of questions. Students can discuss answers with their elbow partners. Circulate around the room, and listen to the student-partner discussions. As an extension activity, have students identify the unit differently on different number lines, and ask students to locate two whole numbers other than 1 and their opposites. Describe to your elbow partner how to find on a number line.