In this lesson, students solve one and two-step word problems involving multiplication and division. (For example, "Ada buys 9 packs of highlighters with 4 in each pack. After giving 1 highlighter to each classmate, she has 17 left. How many highlighters does Ada give away?") In the process, they analyze each problem using tape diagrams and write equations with a letter representing the unknown. This lesson focuses largely on multiplication and division involving units of 9 in order to build fluency with those facts.