How to Find the Central Idea of a Textbook Chapter
Finding the central idea of a textbook chapter can help you with studying, because it allows you to predict which topics your teacher will focus on, and which topics your teacher might consider extraneous. Having this information can reduce the length and increase the quality of your study time, as well as enhance your contribution to study groups with peers. Finding the central idea of a textbook chapter might require you to read the chapter more than once -- the first time to get acquainted with the information, and the second time to use your critical thinking skills.
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Instructions
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Read each section of the chapter. Ask yourself these questions: What is the author trying to tell me? Why is the author presenting this information? How does the information in this section tie into the information in the section before it? Look at each section as a puzzle piece; remember it is your job to discover the final picture.
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Take notes on each section. Look for the central idea in each passage. Read the questions at then end of each section. What information are they asking you to focus on? Remember that the answers to the questions at the end of each section will help point you towards the main idea of that passage.
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Write the main idea of each section within the chapter. Limit the main idea to one sentence.
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Draw a main idea chart. Separate your page into two columns. In the first column, write "Sectional Main Ideas." In the second column, write "Chapter Main Idea." List the main idea of each section in the first column. Spend a moment looking at each topic and thinking about what the topics have in common. When you're ready, write what each topic has in common with one another in the "Chapter Main Idea" column. For example, if your Sectional Main Ideas are, "Agriculture in Africa", "Trading in Africa" and "The Economy in Africa", in the second column you might write "Africa" and "Ways Africans Generate Income".
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Test your theory. Once you've formulated a sentence that states the main idea of the chapter, ask yourself if it pertains to each section. If the main idea isn't mentioned or alluded to in each section, you've got the wrong main idea. For example, if your section heads are "Football," "Hockey," "Tennis" and "Golf," the main idea cannot be "Contact Sports," because that idea only applies to three of the four section heads.
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References
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