# Ch 3: Praxis Biology: Science Principles - Numbers

Use our video lessons and self-assessment quizzes to learn about systems of scientific notation and measurement. These lessons on numbers will aid you in preparing for the Praxis Biology test.

## Praxis Biology: Science Principles - Numbers - Chapter Summary

This chapter's lessons cover numbers and how they are used for scientific measurements. The instructor will explain topics including the metric system, scientific notation and the pH scale. You will learn about the international system of units, called SI units, and explore concepts such as the difference between precision and accuracy. By the end of these lessons, you should be ready for questions on the Praxis Biology test that cover the following topics:

• Units and conversion in the metric system
• Dimensional analysis
• Linear vs. logarithmic scale
• Scientific notation and significant figures
• Calculating a solution's pH or pOH

By showing you how numbers are used in scientific measurement, these concise videos will help you prepare for the exam. Many of the lessons use examples to explain the concepts covered, and you can test what you've learned by completing short quizzes at the end of each lesson. Links to the video lesson are provided, so it's easy to go back and review items again.

### Praxis Biology: Science Principles - Numbers Chapter Objectives

In many states, teachers must pass the Praxis II exam in the subjects they wish to teach. The Praxis II Biology - Content Knowledge test consists of 150 multiple-choice questions. The test can be given on paper or on computer, and you will be allotted two hours to complete it. It is divided into six sections. The material covered in this chapter's lessons on numbers are in section I, Basic Principles of Science. This section has 12 questions, which comprise 8% of the test's total.

6 Lessons in Chapter 3: Praxis Biology: Science Principles - Numbers
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

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