1. HOW TALL IS THE TREE? An application of proportional relationship and direct variation

2. Unit Summary Vernonia has been the heart of the most important timber-producing of the Oregon state, and logging has played a tremendous role in the history of the town. As tradition carries on from many generations, many Vernonia students want to be loggers in the future. There are total 46 math topics that logging workers need to know. Among of them are the application of proportional relationship and direct variation. This unit will focus on the conceptual understanding of proportional relationship and direct variation. In order to demonstrate this understanding, students will use models, draw pictures, use multiple appropriate representations to their audiences. Finally, they will apply their understanding of the unit in a culminating project.

3. ESSENTIAL QUESTIONS Is it important that logging workers need to know the proportional relationships and direct variations?

4. UNIT QUESTIONS Are proportional relationships and direct variation important for logging workers or they can work without them? How can understanding proportional relationship and direct variations make their logging job easier?

5. CONTENT QUESTIONS What is a proportion? How to consider the polygons are similar? How can proportion be used to solve problems? How can the equation y = kx represent the proportional relationship? How proportional relationships can be described by using rules, tables, or graph?