Ch 12: Praxis Middle School Math: Ratios & Rate of Change

About This Chapter

Watch these lesson videos to prepare for questions on the Praxis Middle School Mathematics exam. They emphasize ratios, proportions, the rate of change, scale factors and percentages.

Praxis Middle School Math: Ratios & Rate of Change - Chapter Summary

In this chapter, our expert instructors will help you improve your ability to solve problems involving ratios, proportions, rate of change, scale factors and percentages. In each short, engaging lesson video, these instructors will present and solve example problems for your benefit. After you've watched these lessons, you should be prepared for questions on the Praxis Middle School Mathematics exam that highlight:

  • The relationship between ratios and proportions
  • The process of solving proportions problems
  • Average rate of change
  • Uses of proportions when making scale models
  • Applications of scale factors
  • The interpretation of scale drawings
  • Percentage problems
  • Calculations for taxes and discounts

These videos are mobile device-compatible. For a more portable and versatile way to study the lessons, you may watch them on any of your Internet-ready technology. After you've viewed a lesson video, read its transcript for a written overview of the material that will help you reinforce your retention of the information. If you develop a question during this chapter, be sure to ask our instructors for assistance via the lessons' teacher tabs.

7 Lessons in Chapter 12: Praxis Middle School Math: Ratios & Rate of Change
Test your knowledge with a 30-question chapter practice test
Ratios and Proportions: Definition and Examples

1. Ratios and Proportions: Definition and Examples

Watch this video lesson to learn how ratios and proportions are related. Also, learn how ratios and proportions are used in real life and how you can apply them to yours.

Solving Problems Involving Proportions: Definition and Examples

2. Solving Problems Involving Proportions: Definition and Examples

Learn how you can use proportions to find missing sides and how to increase or decrease the sizes of objects to create models of them in this video lesson.

Average Rate of Change: Definition, Formula & Examples

3. Average Rate of Change: Definition, Formula & Examples

Average rate of change and slope of a line are very interconnected. They are actually one in the same. In this lesson, we will be discovering how they are interconnected.

Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures

4. Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures

How do shapes change sizes yet retain their proportions and similarities to other shapes? In this lesson, we'll look at what a scale factor is and how to apply it. We'll consider scale factors with regards to three different aspects of similar shapes: perimeter, area and volume.

How to Read and Interpret Scale Drawings

5. How to Read and Interpret Scale Drawings

Watch this video lesson to learn how scale drawings and legends are used on maps and blueprints. Learn skills that will serve you well when traveling and when looking at the blueprints of a car.

Percents: Definition, Application & Examples

6. Percents: Definition, Application & Examples

Maybe you know that 95% is an A and 75% is a C. But what do those percents really mean? In this lesson, we'll learn about percents, including how to convert them to fractions and decimals.

Taxes & Discounts: Calculations & Examples

7. Taxes & Discounts: Calculations & Examples

When you go shopping, you don't want to be surprised by the amount of tax on an item. You also want to fully understand discounts to know how much you can save. In this lesson, we'll practice calculating both tax and discounts.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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