You can read the words now. This room is about what a whole paragraph is saying. The topic is what it is about — one or two words, like bears. The main idea is what the paragraph SAYS about the topic, and it takes a sentence, because it can be true or false. Everything else is a detail holding it up. Learn to tell those three apart and you can summarize anything, and spot the sentence that does not belong. Five tabs — cards for the three, hints with the finding steps, a quiz that asks you to pick between a topic and a main idea, and a workshop where you sort twelve statements, put the finding steps in order, label a paragraph and say why bears is not a main idea.
Four sentences. Before you ask what they say, ask what they are all ABOUT. One word keeps coming back — bears, they, their, they.
The topic is what a paragraph is about — a word or two, and it cannot be true or false. The main idea is what the paragraph SAYS about that topic, and it takes a whole sentence, because it CAN be true or false. Everything else is a detail holding it up. Find the topic, write the claim, then check that every other sentence supports it.
Two things people get wrong
⚠️People often think…
The main idea is the first sentence, so I will just copy that one down.
It often is — because putting the point up front is polite to the reader. But a writer building an argument saves it for the end, after so or that is why, and some paragraphs never state it at all and you have to build it yourself. Position is a two-second first guess, not an answer.
Guess from position. Then test the guess against every sentence.
⚠️People often think…
This answer is true, so it must be the main idea.
The wrong answers are usually true as well. “Bears eat a lot in autumn” is true and covers one detail — too narrow. “Animals are interesting” is true and covers the whole world — too broad. You are not checking whether it is true. You are checking whether it is the size of this paragraph.
One detail left hanging means too narrow. Room left over means too broad.
Topic, claim, check
1Watch one
A paragraph gives three facts about recycling and never states an idea. Build the main idea.
Find the topic first: recycling keeps coming back, so the topic is recycling.
List what the details actually say: it saves landfill space, it saves energy, it saves the town money.
Ask what all three have in common — they are all ways recycling helps. Write it as a sentence: “Recycling helps a town in more ways than one.”
Check it against all three. Each one is a way it helps, so none is left hanging. It fits.
2Do one with me
The bear paragraph again. Name each one.
“Bears” is the
“Bears get ready for winter in three ways” is the
“Their fur grows thicker” is a
💬One sentence, then you move on
Why does a main idea need a whole sentence, when a topic only needs a word?
3Try one
What must a main idea be able to be, that a topic can never be? Write one word.
I want a hint first
It is the pair of words you use when you check whether something is so.
Where this goes
Where this lives
This is the move behind every “what was that about?” — a chapter, a news story, a set of instructions, a message from a friend. You are pulling one sentence out of many and checking the rest holds it up.
What this feeds
Next room: a story does not state its idea anywhere. So where does it live?
Read one paragraph today and say its main idea out loud in your own words.
One card at a time — tap “Show me” to check yourself, then Next. Start at Foundation; when those feel easy, climb.
Helpful Hints
🧭 The unit in one line
Ask what the paragraph is about — that is the topic → then ask what it SAYS about that topic — that is the main idea, and it needs a whole sentence → everything else is a detail holding it up.
Topic = a word. Main idea = a sentence. Details = the legs.
🔑 The one idea
A topic cannot be true or false. “Bears” is not true and it is not false — it is just a subject. “Bears get ready for winter in three ways” CAN be true or false, and that is exactly what makes it a main idea.
⚠️ Traps to avoid
The main idea is not always the first sentence. It is often first, sometimes last, and sometimes it is never written down at all — then you build it yourself.
A one-word answer is a topic, not a main idea. If your answer has no verb in it, you have not finished.
The biggest, most interesting detail is still a detail. Ask whether the paragraph is ABOUT it or whether it is only an example.
A main idea that only covers half the details is too narrow. It has to hold up all of them, or nearly all.
📐 The three — the chart
It is a…
How long
Example
Topic
a word or two, no verb
Bears in winter
Main idea
a whole sentence
Bears get ready for winter in three ways.
Detail
a sentence that holds it up
They eat twice as much in autumn.
Too narrow
covers only one detail
Bears eat a lot in autumn.
Too broad
covers more than the paragraph does
Animals are interesting.
🎯 How you will be asked
“What is the main idea of this paragraph?”
“Which sentence states the main idea?”
“Which detail does NOT belong?”
“Is this a topic or a main idea?”
“Summarize this paragraph in one sentence.”
✅ Before the test, can you…
Say the difference between a topic and a main idea in one sentence?
Find the main idea when it is the LAST sentence?
Build a main idea for a paragraph that never states one?
Tell a main idea that is too narrow from one that fits?
Spot the sentence that does not support the main idea?
Pick your level
Look back at anything you missed — the hint that appeared is exactly what to reread tonight.
How sure did you feel?
Workshop
Work like a reader who can summarize anything: sort twelve statements into topic, main idea and detail, put the finding steps in order, label a paragraph diagram, then say why “bears” can never be a main idea.
Your practice never leaves this device. There is no account and no sign-in. Your work is saved in this browser only, and you can erase it whenever you want.
Your practice record — saved on this device
This is your record of the module on screen — it stays here and goes nowhere. Independent means you got it right on the first tap; supported means you got it after the explain-and-retry, or marked ‘I had it’ on a revealed answer. Both count, and neither is a grade. If your teacher asks, copy the row or show them this screen.
Date
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Topic
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Level
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Independent
0 of 0
Supported
0 of 0
Hints used
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Cards studied
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Lab
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Traps met
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Explained in own words
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Confidence
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The answer key is for a teacher: it prints only from here, for the unit on screen. Print the study packet prints the study pages and a blank quiz — never the answers.