Description: n Topic D, students solve two types of division situations-partitive (group size unknown) and measurement (number of groups unknown)-using factors of 2 and 3. Students build on their background knowledge of tape diagrams and apply it to represent division. In Lesson 11, the tape diagram is used as a tool to help students recognize and distinguish between types of division. By the end of Lessons 11 and 12, students independently draw and label tape diagrams that help them to compare and analyze problems that may use the same division sentence but have quotients representing different things. Lesson 13 solidifies growing understanding that the unknown can also be found from the related multiplication sentence.