Central Ideas and Details

Central Ideas and Details questions ask what a short text is mostly about, or what it says about one specific point. You will see two kinds of question: main idea ("Which choice best states the main idea of the text?") and detail ("According to the text, what does Marisol do...?" or "Based on the text, how do X differ from Y?"). Passages can be informational (science, history, the arts) or literary (a short excerpt from a story).

• The main idea is the point the whole text supports. Every sentence should fit under it.
• In informational texts, the main idea is often stated near the end, after a "however," "but," or "in fact" turns the text toward its real point.
• In literary texts, the main idea is usually about a character: what they feel, want, or realize. Look at what the character does and what the narrator lingers on.
• A detail answer must be directly stated (or a very close paraphrase). If you have to guess, it is wrong.
• The right answer is often plain and slightly boring. Wrong answers are often more dramatic.

Rule: summarize the text in your own words in about ten words before reading the choices. Then pick the choice closest to your summary.

Many people assume that ancient bridges were built by trial and error. However, records from one Roman province show that engineers tested small model arches before building full-sized ones. They recorded which shapes held the most weight and used those results to plan their bridges.

Which choice best states the main idea of the text?

A) Roman bridges were stronger than modern bridges. B) Some ancient engineers used planned testing rather than guesswork. C) Roman engineers built model arches from stone. D) Most ancient bridges collapsed within a century.

Your summary: "Romans tested models first, not trial and error."

1. A is off-topic: modern bridges are never mentioned.
2. C is too narrow, and "from stone" is not stated.
3. D is off-topic.
4. B matches the contrast set up by "However." Answer: B.

The following text is from a story. Teo has worked in his uncle's bakery every summer.

Teo had always complained about the early mornings, the flour in his hair, the endless trays. But on his last day before leaving for college, he arrived an hour early. He kneaded the dough slowly, as if memorizing the feel of it, and when his uncle offered to let him leave at noon, Teo shook his head and reached for another tray.

Which choice best states the main idea of the text?

A) Teo is relieved that he will no longer have to work early mornings. B) Teo's uncle wants Teo to stay and run the bakery. C) Despite past complaints, Teo is reluctant to leave the bakery behind. D) Teo has become a more skilled baker than his uncle.

1. A contradicts the text: he arrives early and refuses to leave.
2. B is about the uncle, and the uncle actually offers to let him go.
3. D is never stated; no comparison of skill is made.
4. C covers both halves: the old complaints ("had always complained") and the new behavior ("memorizing," "shook his head"). Answer: C.

• Picking a true detail as the main idea. "Teo kneaded the dough slowly" is true, but it is evidence for the main idea, not the main idea itself.
• Stopping at the first sentence. Many texts open with a view that the author then corrects. The correction is the point.
• Bringing in outside knowledge. If the text does not say it, it is not the answer, even if it is true in real life.
• Extreme words. "Always," "never," "only," and "proves" are red flags unless the text uses equally strong language.
• Ignoring the intro line on literary passages. It often tells you who the character is and what situation they are in.