On the test
Usually questions 8 to 14 of each Reading and Writing module (27 questions per module, 2 modules). The module order is Craft and Structure, then Information and Ideas, then Standard English Conventions, then Expression of Ideas.
12 to 14 questions in the whole test (about 6 or 7 in each module). Usually questions 8 to 14 of each module.
How I approached it
A small story from Aime
When I first met this kind of question, I tried to read every word with the same care. It was slow and it did not help. Then I thought about a friend coming home after a long bus ride. If I ask how the trip was, he does not list every stop. He says, "Long, but we arrived early." The loud music and the woman with chickens are real, but they are small stops on the road. The main idea is where the bus went. Central Ideas and Details on the SAT asks for the same two things. Either give me the one sentence a friend would tell, or point to one stop that the text clearly names. Find the road first, then the stops.
This skill is one of the friendliest on the test, because the answer is always written in the passage. You only need to learn what to look for, and you can learn that this week.
What is inside this part
You choose the sentence that states the big point of the whole text.
best states the main idea · best summarizes the text · overall point of the text
You choose a fact that the text says directly.
according to the text · the text states that · what happened or what a person did
In a story, you choose the option that describes how a character or situation changes or what the character feels.
character feelings · beginning versus end · lesson or realisation
How to know a question is from this part
A short text followed by a question asking for the main idea, a summary, or a fact stated in the text.
- The question says: which choice best states the main idea of the text
- The question says: which choice best summarizes the text
- The question says: according to the text
- There is no blank, no quotation to support, and no table
- All four options are about the same topic and sound close
The lesson
1. What this skill is
Central Ideas and Details questions ask you to understand what a short text says. The text can be a story, a science paragraph, a history note or an opinion. You are not asked to know anything outside the text. Everything you need is on the screen.
There are two kinds of tasks. In one, you find the main idea, which means the big point of the whole text. In the other, you find a detail, which means one small fact that the text states directly.
2. What the question is really asking
When the question says "Which choice best states the main idea of the text?" it wants the idea that covers the WHOLE text, not just one sentence. Think of it as the answer to this question: if I had only ten seconds to tell a friend about this text, what would I say?
When the question says "According to the text, ..." it wants a fact that is written there. You are like a clerk checking a record. If the record does not say it, the answer is wrong, even if it sounds true in real life.
3. Words you need to know
Main idea (central idea): the big point of the whole text.
Detail: a smaller fact or example that supports the main idea.
Summary: a short version of the text that keeps the main idea and leaves out small details.
Too narrow: an option that is true but covers only one small part.
Too broad or extreme: an option that says more than the text says, often with words like always, never, all, or only.
4. The method, step by step
Step 1. Read the question first so you know if you need a main idea or a detail.
Step 2. Read the text once, and ask yourself in each sentence: what is the writer doing here? Setting a problem, giving an example, or giving a result?
Step 3. Say the main idea in your own words, in one short sentence, BEFORE you look at the options.
Step 4. Compare each option with your sentence. Cross out options that are too narrow, too broad, or not in the text.
Step 5. Check the winner against the text one last time. Every part of it must be supported.
5. Worked example 1: a main idea
Read this carefully and notice how the first sentence gives the topic and the last sentence gives the point.
Kofi repaired phones in a small shop. At first, customers brought only broken screens. Over time, he learned to fix batteries and water damage too, and soon people travelled from other towns to find him. His shop grew because he kept learning new skills. Which choice best states the main idea? A. Kofi's shop grew because he kept learning new skills. B. Customers often break phone screens. C. Kofi moved his shop to another town. D. Water damage is hard to repair.
Show the steps
- My own sentence: Kofi learned more skills and his shop grew.
- Option B is a detail from the start only, so it is too narrow.
- Option C is not in the text. People travelled to him, he did not move.
- Option D is not claimed. The text only says he learned to fix it.
- Option A matches my sentence and the last sentence of the text.
A
6. Worked example 2: a detail
For detail questions, find the exact words in the text and match them. Do not use what you already know.
A study of two villages found that the village with a new borehole saw fewer cases of stomach illness in the first year. The other village, which still used the river, saw no change. According to the text, what happened in the village with the borehole? A. People stopped using the river completely. B. There were fewer cases of stomach illness. C. The river became cleaner. D. The other village built a borehole.
Show the steps
- Look for the words about the borehole village: "fewer cases of stomach illness".
- Option A is not stated. Option C is not stated. Option D is the opposite of the text.
- Option B uses the same idea as the text.
B
7. Worked example 3: a story
In stories, the main idea is often about a person and a change. Ask: what does this person feel or learn from beginning to end?
Nadia had always thought the old drum in her grandfather's house was just noise. One evening he let her play it. At first her hands felt clumsy, but slowly she found the rhythm, and she saw why he loved it. Which choice best states the main idea? A. Nadia's grandfather owns an old drum. B. Nadia dislikes music. C. Nadia comes to understand why her grandfather loves the drum. D. Nadia's hands are clumsy.
Show the steps
- The text starts with Nadia's old view (just noise) and ends with a new view.
- A and D are small details. B is the opposite of the ending.
- C describes the change from beginning to end.
C
8. Common traps
Trap 1: The true but small option. It is in the text, but it is only one sentence of it. For a main idea question, it is too narrow.
Trap 2: The exaggeration. The text says some, the option says all. Words like always, never, only and completely should make you slow down.
Trap 3: The outside fact. The option may be true in real life, but not in the text. The SAT only rewards what the text supports.
Trap 4: The opposite. A wrong option uses the right topic words but reverses the meaning. Read the verbs and the small words like not, but, and although.
See it
- 1Read the question: main idea or detail?
- 2Read the text once and notice the first and last sentences
- 3Say the point in my own words
- 4Remove options that are too narrow, too broad, or not in the text
- 5Check the last option against the text
- Asks: best states the main idea, best summarizes, overall point
- Answer covers the whole text
- Wrong options are too narrow or too broad
- Asks: according to the text, the text states, what does X do
- Answer is one stated fact
- Wrong options are outside facts or reversed facts
| Wrong option type | What it looks like | What I do |
|---|---|---|
| Too narrow | True, but only one sentence | Ask: does it cover the whole text? |
| Too broad | Says more than the text | Look for extreme words |
| Not in text | Real-life fact | Find the sentence that proves it |
| Reversed | Right topic, wrong direction | Check not, but, although |
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