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SAT Reading and Writing skill page

SAT Main Idea Practice

Find the answer that captures the whole passage, not just one interesting detail.

Practice main idea in Dolphin SATPractice questions
10-16 min practice time3 questions on pageInformation and Ideas
Practice time10-16 min
Practice questions3 questions
Best forInformation and Ideas

What this tests

What to know for this SAT skill

Dolphin practice questions

Practice your skill

Question 1 of 3Easy
A passage explains that urban gardens can reduce heat, provide food, and strengthen neighborhoods. What is the main idea?
  1. Urban gardens have several community benefits.
  2. Urban gardens are difficult to maintain.
  3. Food prices are rising in cities.
  4. Neighborhoods should ban gardens.
Show answer and solution
Correct answerA. Urban gardens have several community benefits.

Solution walkthrough

  1. This answer covers all three benefits mentioned in the passage.
Question 2 of 3Medium
A passage describes how one scientist revised her theory after new evidence appeared. What is the best summary?
  1. Scientists never change their ideas.
  2. New evidence can lead researchers to update explanations.
  3. The scientist ignored the data.
  4. The theory was unrelated to evidence.
Show answer and solution
Correct answerB. New evidence can lead researchers to update explanations.

Solution walkthrough

  1. The summary captures the full point: evidence changed the explanation.
Question 3 of 3Hard
A passage argues that restoration projects should measure ecological health, not just visual beauty. What is the central claim?
  1. Beautiful landscapes are always healthy.
  2. Restoration should be judged by ecological outcomes.
  3. Ecology is less important than appearance.
  4. All restoration projects fail.
Show answer and solution
Correct answerB. Restoration should be judged by ecological outcomes.

Solution walkthrough

  1. The claim focuses on how restoration should be evaluated.

Avoid these traps

Common mistakes on this skill

Choosing a memorable detail

A main idea must account for the passage as a whole, not just one striking example.

Selecting a statement broader than the passage

The correct answer preserves the passage's subject, scope, and degree of certainty.

Study plan

How to practice this skill in Dolphin

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  1. Identify the subject and what the author says about it.
  2. Summarize the passage in one sentence without examples or minor details.
  3. Reject choices that are too narrow, too broad, or stronger than the author's claim.
Practice main idea in Dolphin SAT

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FAQ

Questions about SAT Main Idea Practice

Is main idea the same as topic?

No. The topic names the subject; the main idea states the central point the author makes about it.

How can I distinguish a main idea from a supporting detail?

The main idea explains why the major details are included, while a detail supports only part of that larger point.