SAT Reading & Writing · Information and Ideas

Central Ideas and Details

Part of Information and Ideas — about 26% of the Reading and Writing score, 12-14 questions on every Digital SAT.

The rule

The SAT wants the one idea the whole passage is built around, not a detail from a single sentence. All sentences support this idea. Wrong answers often repeat exact words but shift the meaning.

Worked example

"Cocoa" is an example of a loanword—that is, a word that originated in one language and was later adopted by another. The word came to English indirectly from cacao, the Spanish word for the plant that chocolate is made from. Spanish had borrowed it from Nahuatl, an Indigenous language of Central Mexico, in which the word's original form is cacahuatl. "Puma" is also Indigenous in origin and entered English through Spanish. But in this case, the original source was Quechua, a language of South America, in which the word for the mountain lion is also puma.

The author makes which point about the Spanish language?

  • A.

    It has served as a medium through which Indigenous languages have influenced English.

  • B.

    Its contribution to English vocabulary roughly equals the collective contribution by Indigenous languages.

  • C.

    It adopted Nahuatl and Quechua words in approximately equal numbers.

  • D.

    It has borrowed words from Indigenous languages and contributed words to them.

Walk through it

Choice A is correct. Both "cocoa" and "puma" originated in Indigenous languages (Nahuatl and Quechua) and entered English through Spanish, showing Spanish acted as a go-between for Indigenous words reaching English. This matches "served as a medium through which Indigenous languages have influenced English." Choices B and C make unsupported quantitative claims, and D claims Spanish also contributed words to Indigenous languages, which isn't discussed.

The traps

Right words, wrong relationship.

A choice uses key terms but twists the connection: the passage says X causes Y, the trap says X follows from Y.

A fact, not the point.

A choice states a true detail that is only support or an example. The main idea must cover what the whole passage sets up.

Extreme or extra claim.

A choice adds a word like "always," "entirely," or "must" that makes it too wide. Or it inserts a judgment (better, worse) the passage never makes.

The procedure

  1. Read the first two sentences. They set up the topic and the author's angle.
  2. Pause and name the key relationship: "This text is about X, and the point is Z."
  3. Eliminate choices that match a trap. A detail from the middle cannot be the main idea.
  4. Pick the choice that covers the whole passage. Test: drop that sentence before the text — it should sound like a summary, not a stray fact.
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Drill this skill

Rule, traps, and procedure drawn from the verified skill playbook for “Central Ideas and Details” (drafted against real questions, verified by a second independent pass — see lib/content/playbooks/central-ideas-and-details.md). Worked example is a real, verified SAT practice question from the live question bank, not generated for this lesson.