# Ch 13: Elementary Math: Proportional Relationships & Number Theory

Review the lessons in this chapter to study elementary math instruction strategies for number theory and proportional relationships. The chapter includes short lessons and quizzes that can boost your teaching skills or help you study for a teacher certification test.

## Elementary Math: Proportional Relationships & Number Theory - Chapter Summary

In this chapter, our expert instructors break down a variety of topics and instructional strategies for elementary math. These lessons focus on proportional relationships and number theory, and as you progress through the chapter, you'll review instructional strategies related to ratios, rates, proportions, factoring, multiples, prime numbers and composite numbers. When you're finished with the chapter material, you should be able to:

• Interpret examples of ratios and rates
• Find unit rates
• Make ratio and proportion calculations
• Teach students how to factor
• Recognize prime and composite numbers
• Define the concept of a multiple in math

When you finish a lesson, try the accompanying self-assessment quiz to check your understanding of the material. If you get a quiz question wrong, you'll be able to go back and find the correct answer within the lesson. You can submit questions though the Ask the Expert feature if you need any help with the material, and to make your studying experience flexible, we've made the chapter materials accessible on any device that has an Internet connection.

6 Lessons in Chapter 13: Elementary Math: Proportional Relationships & Number Theory
Test your knowledge with a 30-question chapter practice test
Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

### Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.