This site contains many lessons listed under Math Topics. Each lesson starts with an explanation. After reading the instruction for each lesson, click Start to get a problem. Click Reset to get a new problem. For this chapter, focus on the lessons under the Ratios topic.
The Office of Arithmetic & Pre-Algebra on this site contains 14 useful lessons under Pre-Algebra. For this chapter, focus on Lesson 11: Ratios and Proportions.
Some of the material on this site goes beyond the skills on the GED Test, but much is useful. The site includes lessons (L), practice (P), and teacher resources (T). For this chapter, focus on the following lessons in the Measurement section: