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Learn how to find the big ideas in any text, spot the details that support them, and write a strong summary.
Have you ever read a whole chapter of a textbook and then thought, "Wait — what was that even about?" You're not alone! That happens when we don't stop to figure out the main ideas of what we're reading. Learning to find main ideas, notice the key details that support them, and summarize a text are some of the most powerful reading skills you can have. They help you understand what you read, remember it longer, and explain it to someone else.
These skills have been important for as long as people have been reading and writing. Here is a quick look at how thinkers throughout history learned to pull out the most important ideas from what they read.
Today, you deal with more information than any generation in history — websites, articles, textbooks, and more. Being able to quickly figure out the main ideas in any text is like having a superpower for school and life!
Before we practice, let's make sure we know exactly what these important terms mean. Understanding these four ideas will make everything else in this lesson much easier.
The diagram below shows how a single text can have two main ideas, each supported by its own set of key details. Notice how the main ideas sit at the top, and the details branch out below them — just like roots holding up a plant.
As you can see, a text often has more than one main idea. Your job as a reader is to figure out what those big ideas are, find the details that back them up, and then put it all together in a summary. The summary lives at the bottom because it comes after you understand the main ideas and key details.
Here is a step-by-step method you can use with any informational text. Follow these steps and you will be able to figure out the main ideas, find the key details, and write a summary every time.
One of the trickiest parts of this skill is knowing the difference between a main idea and a key detail. Here's a helpful way to think about it: the main idea is big and general, while a key detail is specific and supports the main idea.
Let's look at a short sample passage and then see a flowchart that shows you how to decide which is which.
This passage has two main ideas: (1) Honeybees are important for growing our food, and (2) Honeybees are in danger. Each main idea is supported by several key details. Let's see a flowchart that helps you sort them out.
Use this flowchart any time you're not sure. Ask the two questions, and you'll be able to sort sentences into main ideas, key details, or extra details.
| Feature | Main Idea | Key Detail | Extra Detail |
|---|---|---|---|
| How broad is it? | Very broad — covers the whole section | Specific — supports one main idea | Specific but not tied to a main idea |
| Could it be a heading? | Yes — it could work as a title | No — too specific for a heading | No |
| Does it answer "What is this about?" | Yes | It answers "How?" or "Why?" or "What proof?" | Not really |
| Include in summary? | Always | Usually — if it's important | Rarely — leave it out |
Let's walk through the full process using the bee passage from Section 5. We'll find the main ideas, pick out the key details, and then write a summary together.
Notice how the summary includes both main ideas and the most important key details, but it's much shorter than the original passage. We also wrote it in our own words instead of copying the author's exact sentences.
Even strong readers make mistakes when finding main ideas and writing summaries. Here's a quick guide to what works and what to watch out for.
| ✅ Strong Moves | ❌ Common Mistakes |
|---|---|
| Pausing after each section to ask "What was this mostly about?" | Trying to find the main idea of the whole text without reading section by section |
| Using your own words in the summary | Copying full sentences from the text word-for-word |
| Including both (or all) main ideas in the summary | Only mentioning one main idea and forgetting the others |
| Choosing key details that directly support the main idea | Including every detail — even the minor, interesting ones that don't support the big idea |
| Keeping the summary much shorter than the original | Making the summary almost as long as the original text |
| Leaving out your own opinions or feelings | Writing "I think bees are cool" in a summary (that's your opinion, not the author's idea!) |
Finding main ideas and summarizing are skills you'll use in every grade and every subject — not just ELA! Here's how this skill connects to more advanced reading you'll do soon.
| What You're Learning Now | What Comes Next |
|---|---|
| Finding two or more main ideas in a text | Analyzing how an author develops and connects multiple central ideas across a long text |
| Explaining how key details support main ideas | Evaluating whether an author's evidence is strong enough to prove their point |
| Writing a summary in your own words | Writing a critical analysis that summarizes AND shares your own argument about the text |
| Telling main ideas apart from details | Identifying an author's purpose and point of view based on how they present ideas |
In middle school, you'll start reading longer articles and books with more complex structures. The skills you're building now — finding main ideas, noticing how details support them, and summarizing — will be the foundation for everything that comes next. Think of these skills as the "training wheels" that you'll eventually ride without, but only because you practiced them so well!
Try these five problems to practice your new skills. Read each question carefully, think about your answer, and then click "Show Answer" to check. The problems get a little harder as you go — you've got this!
In this lesson, you learned how to find two or more main ideas in an informational text by asking "What is this section mostly about?" You practiced identifying key details — the facts, examples, and reasons that support each main idea — and learned to tell them apart from extra details that don't directly support the big idea. You also learned the four-step process for reading and summarizing: preview the text, find the main ideas, hunt for key details, and write a summary in your own words.
A strong summary includes all of the main ideas, the most important key details, and is written in your own words — without personal opinions or minor details. Remember the tree analogy: the main ideas are the trunk, the key details are the branches, and a summary is a snapshot of the whole tree. Keep practicing these skills with everything you read, and you'll become a stronger, more confident reader every day!