This chapter has everything you need to know about ratios, proportions, and percents! You will start out learning what ratios, rates, and proportions are and the operations and word problems involving them. From there, you will study how to solve proportions involving variables and then use these proportion solving skills in your travels through similar figures and scale factors. The second half of the chapter is devoted to mastering percents. From the foundations of converting between fractions, percents, and decimals to finding percents, the part, or the whole, through to calculating percent of change, you will leave this chapter knowing percents and how to use them in any way you could possibly need them in Pre-Algebra and beyond! What are you waiting for?! Strengthen your skills and get started!!