SAT Central Ideas and Details questions

What the question looks like

You get one short paragraph and four choices, each a full sentence. There's no blank or graph, and nothing is underlined. Read the question first.

The question says	What you need
“Which choice best states the main idea of the text?” (or “best describes”)	The point the whole paragraph makes
“According to the text, what is true about X?”	One detail about X, from one sentence
“According to the text, why does X ...?”	The reason the text gives
“What does the text most strongly suggest about X?” (or “indicate”)	What all the sentences together say about X
“Which question does the text most directly attempt to answer?”	The question the whole paragraph answers
“Based on the text, how does X most likely feel about Y?” (or “regard,” or “what is X's attitude toward Y?”)	What the text shows X feels
“Based on the text, X would most likely agree with which statement?” (or “say,” “believe”)	A view the text gives X, reworded

Working through a question

The wings of one insect species carry rows of tiny folds. Biologists first thought the folds came from the demands of flight. However, after watching young wings grow, Lena Okafor set that idea aside. Sections of a young wing grow at different rates and buckle as they grow. Okafor proposes that this uneven growth may produce the folds.

Which choice best states the main idea of the text?

A. Sections of a young wing grow at different rates.
B. The folds cause sections of the wing to grow at different rates.
C. Okafor proposes that the folds may come from uneven growth, not from the demands of flight.
D. Okafor has confirmed that uneven growth produces the folds.

Name what the question wants. This one asks for the point of the whole paragraph.
Find the turn. Words like “however,” “surprisingly,” and “one reason” steer a paragraph. So can a question the passage asks, or a purpose like “to test whether.” Here “However” turns away from flight, so the point comes after it.
Sort the point from its support. Names, dates, numbers, definitions, and examples are support. The point is Okafor's idea, and the buckling sections support it.
Say the answer before you look. Don't stop at the topic (the folds). Say what the paragraph claims about them, which is that uneven growth may produce the folds. A paragraph about a person or a discovery may be making its point about a method, a difficulty, or a comparison.

This works when the paragraph names its point. If it doesn't, as when several facts could answer a detail question, sort the choices by whether the passage states each one as fact or only as someone's belief. Above, “sections of a young wing grow at different rates” is stated fact, and “uneven growth may produce the folds” is only Okafor's idea.

Some questions ask what would have happened if one thing had changed, or what would show whether a claim holds up. Work only from the passage's facts. For the first kind, they can give you a prediction. For the second, check each choice against the claim exactly as the passage states it.
Check each choice for size, direction, and strength, and name the word that rules it out.
- A is true, but it comes from one sentence and never mentions the folds, so it's too small.
- B says the folds “cause” the uneven growth, so it has the direction backward.
- D says “confirmed,” but Okafor only “proposes” that growth “may” do it. That turns her belief into a fact, which is too strong.
- C passes all three checks.
If you can't name the word, check that choice again.

When a sentence is hard to read

Reading dense and technical passages shows how to break down a hard sentence and read it to the end.

Name what “that” or “this” points back to. “The roots can't push through the clay. That constraint keeps the trees short.” The constraint is the clay stopping the roots.
Restate a negative plainly. Missing one “not” can flip your answer.

The passage says	Say it as
cannot explain	leaves unexplained
not inconceivable	possible
which do not exist	which are absent
in the absence of	without

Words to know

The Reading and Writing guide covers more, such as concedes, qualifies, and negligible.

Word	Plain meaning
entails	Necessarily includes
tenuous	Weak, barely holding
impede	Slow down or block
efficacy	How well something works
hinges on	Depends on
discount	Disregard (not lower a price)
aggregate	Taken all together
longitudinal	Followed over time
validity	Whether it holds up, or measures what it claims to

Find the turn

“Although the old maps are full of errors, they are the only record of where the river first ran.”

Trap: The idea the text threw away

Main idea: “The old maps are full of errors.” The passage admits this before the turn, but its point is that the maps are the only record.

What to do: Find the turn, then check which side the passage lands on. A passage can also state its point first and then admit a limit after “however.”

Don't pick a sentence for being first or last. An opening can set up an idea the passage then drops, and an ending may just add another example or raise a new question.

Checking size

“Why do bees build hexagons? This shape uses the least wax. A colony must eat a lot of honey to make a little wax.”

A main-idea choice that repeats one supporting sentence is too small. It's most tempting when that sentence has the passage's only number, name, or technical term, because that's the line you remember.

When the choices are questions, pick the one the whole paragraph answers. Here that's “Why do bees build hexagons?” The paragraph mentions honey and wax but never explains how bees make one from the other, so “How do bees make wax from honey?” is wrong.

A detail answer must answer the question asked. If the question is why bees build hexagons, “Making wax takes a lot of honey” is true, but it answers a different question, why saving wax matters.

Checking direction

“Okafor proposes that this uneven growth may produce the folds.”

Draw the link as an arrow: uneven growth → folds. “The folds cause uneven growth” uses the passage's own words with the arrow flipped. Other one-way links can flip the same way, like who got what from whom, or which thing came first or copied the other.

Check whose idea it is, too.

“Lee found the bones in 2019. Park later dated them to 900 BCE.”

Trap: The wrong person

“Lee dated the bones to 900 BCE.” Both names and the date are in the passage, but the dating was Park's.

What to do: For each name in the choice, find the sentence that ties that name to that claim.

Checking strength

“The wings of one insect species carry rows of tiny folds. ... Okafor proposes that this uneven growth may produce the folds.”

A stronger claim needs stronger . When a choice says more than the passage, name what it would need and look for it.

The choice turns	It would need
“can help” into “better than”	A comparison showing an advantage
“one or both” into “both”	Support for each one
an addition into a replacement	Words saying the old thing is gone

Trap: Bigger than the text made it

“Uneven growth always produces folds in insect wings.” The passage says “may,” and it's about one species. The choice drops the “may” and turns one case into a rule.

What to do: Put the passage's limits back and see whether the choice still says the same thing.

A choice can also be too weak. If the passage is certain, a choice that softens it to “sometimes” is wrong, even though it sounds more careful.

Reading for meaning

“A colony must eat a lot of honey to make a little wax.”

Translate the sentence yourself before you compare.

Do this: Put the line in your own words first (wax costs bees a lot to make), then look for a choice that means that.
Not this: Cross off “Wax is costly for bees to produce” because “costly” isn't in the passage.

The question tests whether you understood the sentence, so the answer is reworded on purpose.

“She works the wood with long strokes on the flat sides of the hull and short strokes at the curved bow.”

A choice can also use the passage's words and say something else.

Right: She changes her strokes to fit the shape of the hull.
Wrong: She works most carefully at the curved bow.

“Curved bow” is on the page, but the passage never says where she's most careful.

If all four choices reuse the passage's rare words, run the three checks on each.

Choices that add to the passage

“The technique spread in the same century that the trade routes opened.”

Trap: Outside knowledge

“Merchants carried the technique along the new routes.” It may sound like history you know, but the passage never says it. A likely next step is just as tempting: “The technique soon reached every port on the routes.”

What to do: Find the sentence that says it. If you can't, cross the choice off, even if it's true.

Trap: What this kind of paragraph usually says

“Historians still disagree about how the technique spread.” Plenty of history passages end that way, but this one doesn't.

What to do: Find the sentence where this passage says it.

Trap: Goes wrong at the end

“The technique spread because the trade routes opened.” It starts right, but “because” adds a cause, and the passage gives only the timing.

What to do: Read to the last word, then check the end of the choice against the passage on its own.

When two choices both look right, read only the words where they differ. It can come down to one small word, such as “because,” “may,” “to,” “better,” or “their.”

Stories and poems

The three checks aren't enough here. First list what people do and say in the text, and any thought it states outright.

“At the bow, Ruiz sets the tool down and traces the wood with her fingertips.”

A feeling counts only if the text states it or an action shows it.

Right: She handles the bow with care.
Wrong: She doubts her own work.

Her actions show care. Nothing she does or thinks shows doubt.

A feeling that would merely fit the scene, like frustration or regret, doesn't count either. And one careful moment doesn't mean she's careful all the time.

“As she sands the hull, her mind travels to the harbor where she grew up.”

Don't read a comparison as an event in the story.

Right: She thinks about the harbor where she grew up.
Wrong: She travels to the harbor where she grew up.

Only her mind goes to the harbor. She's still sanding the hull.

Older writing may turn a sentence around; Poetry shows how to put it back in order. Watch for old meanings, too. “Want” can mean lack, and “embarrassed” can mean puzzled. Someone called “enlightened” may just be cultured.

Practice

Work through the three examples with the five steps, then try five more.

Worked example

Craft researcher Imani studied how basket makers keep a container’s sides even as its shape widens. She observed artisans working with flexible reeds and asked which routine helped them control the changing curve. Each maker paused after completing six rows to compare the rim with a simple wooden guide. If one side extended farther, the maker tightened the next row on that side before continuing. Imani found that these repeated checks, rather than an unchanging pull on every reed, allowed the makers to correct small differences before they became obvious. The routine helped the baskets widen evenly.

Which choice best states the main idea of the text?

A
The makers compared each basket rim with a simple wooden guide after completing every six rows.
B
Basket makers in many regions have long used locally available plants to create containers for carrying goods.
C
Checking their progress at regular points helps basket makers make adjustments that keep widening baskets evenly shaped.
D
The findings show that further research should compare basket weaving practices among makers working in several regions.

Show the answer

A
The makers compared each basket rim with a simple wooden guide after completing every six rows.
This choice focuses on the numbered detail that the makers checked the rim every six rows, but it omits what those repeated checks accomplished: they guided adjustments that kept the baskets even.
B
Basket makers in many regions have long used locally available plants to create containers for carrying goods.
This choice adds a generally true fact about basket making. The passage discusses flexible reeds and a checking routine, not regional plants or containers used to carry goods.
C
Checking their progress at regular points helps basket makers make adjustments that keep widening baskets evenly shaped.
Correct answer
The makers regularly compared the rim with a guide and tightened the next row wherever one side extended farther. These checks allowed them to correct small differences and widen the baskets evenly.
D
The findings show that further research should compare basket weaving practices among makers working in several regions.
This choice supplies a standard recommendation for further research. The passage reports what Imani found about repeated checks without proposing a comparison among regions.

Solution

The text asks which routine helped basket makers control a widening curve. It explains that the makers paused every six rows, compared the rim with a guide, and tightened the next row on any side that extended farther.

The final sentences give the result of that routine: repeated checks allowed the makers to correct small differences before they became obvious, so the baskets widened evenly. The must include both the regular checks and the adjustments that kept the baskets evenly shaped.

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Worked example

The following text is adapted from a short story. The narrator is an apprentice in Ayla’s village weaving workshop.

When Ayla started undoing the final rows of the cloth lifted from her loom, I assumed she was shortening it to fit the table where she measured each finished length. She draped the excess over one end, however, and explained that the tightness of the final rows caused the inward pull of the edges, narrowing the cloth. Once she had freed those threads, she rewove them more loosely, checking that the width remained even from the first row to the last.

According to the text, why does Ayla undo the final rows of weaving?

A
The cloth needs shortening to fit on her measuring table.
B
The tightness of the final rows pulls the edges inward.
C
The inward pull of the edges caused tightness in the final rows.
D
The final rows pull the edges inward and lower the cloth’s price.

Show the answer

A
The cloth needs shortening to fit on her measuring table.
This adopts the ’s initial explanation, which Ayla’s actions discard. She lets the excess hang over the table, so the cloth does not need shortening.
B
The tightness of the final rows pulls the edges inward.
Correct answer
Ayla explains that the tight final rows pull the edges inward and narrow the cloth. She undoes those rows so she can reweave them more loosely and keep the width even.
C
The inward pull of the edges caused tightness in the final rows.
This reverses the cause-and-effect relationship. The tightness causes the edges to pull inward; the inward pull does not cause the tightness.
D
The final rows pull the edges inward and lower the cloth’s price.
This correctly connects the final rows to the inward pull, but its last adds an unsupported consequence. The text discusses the cloth’s width, not its price.

Solution

Ayla first explains the problem: the tightness of the final rows pulls the cloth’s edges inward, making the cloth narrower at the end.

She undoes those rows and reweaves them more loosely so the width stays even from the first row to the last. Therefore, she undoes the rows because their tightness pulls the edges inward.

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Worked example

At a chalk headland, waves had hollowed an alcove beneath a ledge, although from the path above, the cliff still presented an uninterrupted white face. Marisol, whose assistant had pointed to that smooth expanse before folding up the measuring equipment, knelt beside the fallen fragments, matched their edges to the overhang, and reopened the survey case, as though she had found an expense missing from a ledger that had seemed to balance. She entered the fragments’ dimensions before letting her assistant pack.

Based on the text, how does Marisol most likely regard the cliff’s apparent stability?

A
She regrets having missed the ledge’s collapse, regarding the fragments near the alcove as reminders of an opportunity to observe the cliff changing that her morning survey can no longer provide.
B
She considers the cliff’s uninterrupted appearance an incomplete account of its condition, treating the fallen material as evidence that deserves further attention even when the view from above seems to suggest stability.
C
She suspects an omission in the survey’s financial ledger, treating the examination of fragments near the overhang as an occasion to review the team’s expenses before permitting her assistant to finish packing.
D
She habitually distrusts any landscape that appears unchanged, treating an uninterrupted rock face or sheltered alcove as evidence of concealed erosion whenever she encounters such features in the course of her work.

Show the answer

A
She regrets having missed the ledge’s collapse, regarding the fragments near the alcove as reminders of an opportunity to observe the cliff changing that her morning survey can no longer provide.
This choice assigns Marisol regret about missing the fall. Her examination of the and recording of their dimensions show attention to physical evidence; nothing in her actions expresses disappointment about a missed observation.
B
She considers the cliff’s uninterrupted appearance an incomplete account of its condition, treating the fallen material as evidence that deserves further attention even when the view from above seems to suggest stability.
Correct answer
Marisol matches the fallen to the overhang and reopens the survey case to record their dimensions. These actions show that she treats the smooth view from above as an incomplete account of the cliff’s condition.
C
She suspects an omission in the survey’s financial ledger, treating the examination of fragments near the overhang as an occasion to review the team’s expenses before permitting her assistant to finish packing.
This choice takes the ledger comparison literally. The phrase “as though” compares Marisol’s discovery of overlooked physical evidence to finding an expense missing from a ledger that seemed to balance; she records the ’ dimensions, not the team’s spending.
D
She habitually distrusts any landscape that appears unchanged, treating an uninterrupted rock face or sheltered alcove as evidence of concealed erosion whenever she encounters such features in the course of her work.
This choice turns Marisol’s response at one cliff into a habit that applies to every unchanged landscape. The passage shows her investigating fallen at this site and gives no account of how she routinely judges other landscapes.

Solution

The question asks how Marisol regards the cliff’s apparent stability. From the path, the cliff presents an “uninterrupted white face,” even though waves have hollowed an alcove beneath a ledge and have fallen.

Marisol matches those fragments to the overhang, reopens the survey case, and records their dimensions before her assistant packs. The comparison to an expense missing from a ledger that had seemed to balance suggests that the cliff’s smooth appearance, like that ledger, leaves something unaccounted for. Her actions support the conclusion that she considers that appearance incomplete and believes the fallen material deserves further attention.

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5 questions on this skill, with every choice explained.

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