Reading · Key ideas & details
Main Idea & Supporting Details
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Start here: your learning goal
Identify a main idea, distinguish supporting details, and write an accurate summary.
Read the explanations, try the quick checks, then take the lesson quiz to see what to review next.
Optional video introduction
Why This Matters: School, workplace, and public-information texts often spread one central idea across several paragraphs. Efficient readers identify the controlling idea, decide what each paragraph contributes, and compress the passage without importing opinions.
What You Need to Know
Every well-written passage has:
- Main Idea: The central point the author wants to communicate
- Supporting Details: Facts, examples, and evidence that back up the main idea
For a multi-paragraph passage, do not choose a sentence merely because it sounds important. Write a two- to five-word note for each paragraph, then ask what relationship joins those notes. One paragraph may introduce a problem, another may explain causes, and a third may show a response. The best main-idea statement must cover that whole movement.
Topic, Main Idea, and Summary
| Reading task | What a strong answer does | Common trap |
|---|---|---|
| Topic | Names the broad subject | Mistaking a label such as “community gardens” for a claim |
| Main idea | States the author's controlling point about the topic | Choosing one vivid example |
| Objective summary | Restates the main idea and essential relationships concisely | Copying sentences or adding evaluation |
A summary is selective. Keep details that explain a major cause, contrast, turning point, or result. Omit repeated examples, decorative description, and minor numbers unless the number is necessary to understand the claim. A useful test is: Would removing this detail change the passage's logic?
Where to Find the Main Idea
Look at the opening, ending and middle, then test any candidate against the whole passage. A main idea may be implied rather than stated. Location is a search aid, not a guarantee or a frequency rule.
Read a complete passage
For years, a town archive required visitors to search boxes of photographs by hand. Volunteers recently added a searchable catalog with dates and street names. Residents can now locate likely matches before requesting a box.
The catalog is not a complete substitute for visiting. Some photographs lack dates, and fragile originals must still be examined with staff assistance. Volunteers label uncertain identifications rather than guessing.
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