Free ATI TEAS 7 Reading guide
October 2026 - Topic, Main Idea & Supporting Details Study Guide for nursing students in
The topic is what a passage is about in two or three words. The main idea is the one point the author makes about that topic, stated as a full sentence. Supporting details are the sentences that prove it. Nearly every Reading passage carries at least one question on this distinction, so it is the highest-value skill in the section.
Telling the three apart
They form a hierarchy. The topic is the subject, the main idea is the claim made about that subject, and the details are the evidence for the claim.
| What it is | How long | Example | |
|---|---|---|---|
| Topic | The subject of the passage | A word or short phrase | Hospital night shifts |
| Main idea | The single point the author makes about it | One full sentence | Night shifts harm nurses in ways that better scheduling could prevent. |
| Supporting detail | Evidence, examples, statistics, anecdotes | Individual sentences | A study of 2,000 nurses found error rates rose after the tenth hour. |
Where the main idea sits
The main idea is often stated outright, and where it is stated is predictable.
- First sentence — the most common position. The author states the point, then spends the paragraph proving it.
- Last sentence — the author builds a case and lands the point at the end, often after a word such as therefore, so or clearly.
- Nowhere — the main idea is implied. Every sentence points at it but no sentence says it, and you assemble it yourself.
Do not assume the first sentence is the main idea. Passages frequently open with a hook — a striking statistic, a question, a scene — and state the real point in the second or third sentence. Read the whole paragraph before deciding.
The too-narrow and too-broad traps
Wrong answers on main-idea questions are rarely false. They are usually true statements at the wrong scale, and there are only two ways to get the scale wrong.
A too-narrow answer is a supporting detail promoted to main idea. It is accurate, but it covers one sentence rather than the whole passage. A too-broad answer goes further than the passage does: it describes the general subject area, or it adds a claim the author never made. The right answer covers everything in the passage and nothing outside it.
Finding it in a real paragraph
Worked example
Hand hygiene is the cheapest infection control measure available to a hospital, and the least reliably practised. Observational studies routinely find compliance below sixty per cent, even in intensive care. Soap and water cost almost nothing; the cost of a single hospital-acquired infection runs into thousands. The gap is not one of resources but of habit.
- Topic: hand hygiene compliance in hospitals. Two or three words, no claim attached.
- Scan for a sentence that the others support. The opening states a claim and the rest of the paragraph backs it up with figures and a contrast.
- Test the last sentence as a candidate too: "The gap is not one of resources but of habit" is a claim, and every earlier sentence supports it.
- State the main idea as one sentence covering both halves: hand hygiene is cheap and effective but poorly practised, and the reason is habit rather than cost.
- Sort the rest as details: the compliance figure, the cost comparison, the intensive care mention.
Main idea: hand hygiene is the cheapest infection control measure but is poorly followed, and the cause is habit rather than lack of resources. Everything else in the paragraph is a detail supporting it.
A method that survives the clock
At 73 seconds a question you cannot afford to reread. Work in this order.
- Read the passage once, at normal speed, asking only: what is the one point here?
- Say that point to yourself in a sentence before you look at the choices. This is what stops a plausible detail from looking like the answer.
- Check each choice against the whole passage. If it only covers part, it is a detail.
- Reject anything you would need outside knowledge to defend. The answer must be defensible from the text alone.
Terms to know
- Topic
- The subject of a passage, in a word or short phrase. It makes no claim.
- Main idea
- The single point the author makes about the topic, expressed as a full sentence.
- Topic sentence
- The sentence in a paragraph that states its main idea outright.
- Supporting detail
- A fact, example, statistic or anecdote that backs up the main idea.
- Implied main idea
- A main idea no sentence states, which the reader assembles from the details.
- Too narrow
- An answer choice that is true but covers only part of the passage — a detail in disguise.
- Too broad
- An answer choice that goes beyond what the passage says or covers the general subject area instead of the passage.
What the TEAS asks most
The same core ideas appear in different wording. If you can answer these without stopping to think, you have what this section requires.
What is the main idea of the passage?
The one sentence that every other sentence in the passage supports. Not the most interesting sentence, and not the first sentence by default.
Which sentence best states the topic?
A short phrase naming the subject, with no claim attached. If the choice argues something, it is a main idea, not a topic.
Which detail best supports the author's point?
The one that provides direct evidence for the main idea. A detail can be true and interesting yet support something else.
Which statement is a supporting detail rather than the main idea?
The one that covers a single sentence or example rather than the passage as a whole.
Key points
- Topic is a phrase, main idea is a sentence, supporting details are the evidence.
- The main idea is most often the first or last sentence of a paragraph, but it can be implied.
- Wrong answers are usually true statements at the wrong scale: too narrow or too broad.
- Phrase the main idea in your own words before reading the choices.
- If an answer needs knowledge you brought with you, it is wrong. Everything must come from the passage.
Review quiz
4 questions on this topic, each with the reasoning worked through. Pick an answer to see how it went, or open the explanation straight away.
Read the passage, then answer the questions below
Compression stockings are prescribed so routinely after surgery that patients often assume they are optional comfort wear. They are not. By squeezing the leg from the ankle upward, they keep blood moving through the deep veins at a time when a patient is barely walking, which is precisely when a clot is most likely to form. Studies of post-surgical patients consistently show fewer clots in those who wear them as directed. The difficulty is that they are uncomfortable in hot weather and awkward to put on, so many patients quietly stop.
-
Question 1 of 4
Which statement best expresses the main idea of the passage?
Show the answer and explanation
Correct answer: B. Compression stockings prevent clots after surgery, but patients often stop wearing them.
The passage makes two connected points — the stockings work, and compliance is poor — and every sentence serves one of them. Discomfort in hot weather is a supporting detail, so that choice is too narrow. Reduced walking is a detail explaining why clots form. The last choice is a recommendation the author never makes; the passage argues the stockings matter, not that they should be dropped.
-
Question 2 of 4
What is the topic of the passage?
Show the answer and explanation
Correct answer: A. Compression stockings after surgery
A topic is a short phrase naming the subject with no claim attached, and the passage is about compression stockings in a post-surgical context. The second choice states a claim, which makes it a main idea rather than a topic. "Blood clots" and "recovery after surgery" are both broader subject areas that this passage sits inside but does not cover.
-
Question 3 of 4
Which sentence from the passage functions as a supporting detail rather than as part of the main idea?
Show the answer and explanation
Correct answer: C. Studies of post-surgical patients consistently show fewer clots in those who wear them as directed.
The reference to studies is evidence offered for the claim that the stockings work — a textbook supporting detail. The first two choices set up the claim, and the last is half of the two-part main idea, since the whole passage is organised around the gap between how well the stockings work and how often they are used.
-
Question 4 of 4
No single sentence in the passage states its full point. What does that tell you about the main idea?
Show the answer and explanation
Correct answer: B. It is implied, and has to be assembled from what the details have in common.
Here the two halves of the point are spread across the passage — the stockings work, and patients abandon them — so you assemble the main idea from what the details are collectively pointing at. Every passage has a main idea, so the first choice is out, and neither position nor sentence length identifies it. Treating the opening sentence as automatic is the most common error on this question type, because passages so often open with a hook.
Put this TEAS topic into practice
Build a set on topic, main idea and supporting details and use the rationale on every question to reinforce what you just reviewed.
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