Reading Strategy: Determine Importance

Section headings divide a nonfiction selection into its most important, or main, ideas. The supporting details in each section are clues that can help you identify the main idea.

Strategy in Action

This shows how a student identified main idea and details.

Practice Together

As you read each section of “The Constitution,” follow the steps in the How-To box to identify the main ideas and details. Record them on a chart like this one.

Main-Idea Diagram

Main Idea: The Constitution changed the U.S. for the better.
Detail: Before the Constitution, there was no president or leader.
Detail: The government could not collect taxes to pay its bills.
Detail: Money was different in each state.
Detail: Criminals could escape justice.