This Instructional Activity is a part of the Lesson 2, Unit 4, Grade 6. The Discussion is provided if students struggled during Lesson 1. If the Discussion is included in the lesson, the Exploratory Challenge is shortened because students only develop one number sentence. Provide each pair of students with a collection of squares, which they use to create tape diagrams throughout the lesson. Build a tape diagram to represent units. Divide the units into three equal groups.