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SAT Reading and Writing skill page

SAT Central Ideas Practice

Separate the main idea from small details so you can choose the answer that covers the whole passage.

Practice central ideas in DolphinPractice questions
10-16 min practice time3 questions on pageInformation and Ideas
Practice time10-16 min
Question bank3 questions
Best forInformation and Ideas

What this tests

What to know for this SAT skill

Dolphin question bank

Practice your skill

Question 1 of 3Easy
A passage explains that urban gardens provide food, create gathering spaces, and teach residents about plants. What is the central idea?
  1. Urban gardens can benefit communities in several ways.
  2. Urban gardens always replace grocery stores.
  3. Plant biology is difficult to learn.
  4. Cities have too little open land.
Show answer and solution
Correct answerA. Urban gardens can benefit communities in several ways.

Solution walkthrough

  1. This answer covers all three benefits mentioned in the passage.
Question 2 of 3Medium
A passage describes an old theory, presents new evidence against it, and explains why researchers now prefer a different explanation. What is the main purpose?
  1. To argue that research never changes
  2. To explain a shift in scientific understanding
  3. To list every researcher in a field
  4. To describe one experiment in detail only
Show answer and solution
Correct answerB. To explain a shift in scientific understanding

Solution walkthrough

  1. The passage moves from an old theory to new evidence and a new explanation.
Question 3 of 3Hard
A passage discusses how a novelist uses ordinary household objects to reveal characters emotions. Which summary best captures the central idea?
  1. The novelist writes only about houses.
  2. Objects in the novel help show characters inner lives.
  3. The novel avoids describing emotions.
  4. Household objects are more important than characters.
Show answer and solution
Correct answerB. Objects in the novel help show characters inner lives.

Solution walkthrough

  1. This choice captures the broad function of the objects without exaggerating.

Avoid these traps

Common mistakes on this skill

Choosing a detail instead of the main idea

A detail can be true but too narrow to summarize the passage.

Picking an extreme answer

Words like always, never, and only often go beyond what the passage supports.

Ignoring the passage structure

The way ideas develop often reveals whether the purpose is to explain, argue, compare, or question.

Study plan

How to practice this skill in Dolphin

  1. After reading, state the passage in one plain sentence.
  2. Check whether each answer covers the whole passage.
  3. Eliminate answers based on only one sentence or example.
  4. Avoid choices that add claims the passage never makes.
Practice central ideas in Dolphin

Related practice

Build the surrounding skills

SAT Command of Evidence PracticeSAT Words in Context PracticeSAT Rhetorical Synthesis PracticeSAT Reading and Writing skill hub

Skill cluster

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FAQ

Questions about SAT Central Ideas Practice

What are central ideas questions on the SAT?

They ask for the main idea, best summary, or purpose of a short passage.

How broad should a central idea answer be?

It should be broad enough to cover the whole passage but specific enough to match what the passage actually says.

Why do I miss main idea questions?

Most misses happen when a student chooses a true detail instead of the answer that captures the full passage.