English Language Arts
Grade 3
15 min
Organize information by main idea
Organize information by main idea
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1
Introduction & Learning Objectives
Learning Objectives
Define 'main idea' and 'supporting detail' in their own words.
Identify the main idea in a short, grade-appropriate paragraph.
Find at least two supporting details that connect to a main idea.
Sort a list of sentences into a main idea and its supporting details.
Explain why a specific detail supports a main idea.
Create a simple graphic organizer to show a main idea and its details.
Have you ever tried to organize your toys in a toy box? 🧸 You put all the cars together and all the dolls together. We can do the same thing with ideas when we read!
In this lesson, we will learn how to find the main idea, which is the most important point in a paragraph. We will also find the supporting details that tell us more about that big idea. This...
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Key Concepts & Vocabulary
TermDefinitionExample
Main IdeaThe most important point the author is trying to make. It's the 'big idea' of the whole paragraph.If a paragraph is about a dog that can fetch, bark, and roll over, the main idea is 'The dog knows many tricks.'
Supporting DetailA smaller piece of information, like a fact or an example, that tells more about the main idea. They are the 'little helpers.'For the main idea 'The dog knows many tricks,' a supporting detail is 'It can roll over on command.'
ParagraphA group of sentences that are all about one topic.A few sentences all about how to plant a seed would be one paragraph.
TopicThe one person, place, or thing the paragraph is about. It's usually just one or two words.If a paragraph talks about a...
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Key Rules & Conventions
The 'What's It Mostly About?' Question
After reading a paragraph, always ask yourself: 'What is this paragraph MOSTLY about?'
Use this question to find the main idea. The answer shouldn't be just one small detail, but the big idea that all the other sentences are talking about.
Details are the Proof
Supporting details must connect back to the main idea and explain it more.
Think of details as clues. If the main idea is a treasure chest, the details are the map clues that lead you there. Each detail should prove the main idea is true.
Find the Topic Sentence First
Look for a topic sentence, which is often at the beginning of the paragraph.
Many times, the author makes it easy by putting the main idea right in the first sentence. Read the...
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Challenging
Read the paragraph: 'Our class trip to the zoo was amazing. We saw lions sleeping in the sun. The monkeys were funny as they swung from ropes. My favorite color is blue. The tall giraffes ate leaves from the tops of trees.' What is the main idea of this paragraph?
A.Monkeys are funny animals.
B.Our class trip to the zoo was amazing.
C.My favorite color is blue.
D.Giraffes are very tall.
Challenging
The main idea is 'Volcanoes can be dangerous.' Which of these is the STRONGEST supporting detail to prove this idea?
A.Hot lava and ash from an eruption can destroy entire towns.
B.Some volcanoes are dormant, meaning they haven't erupted in a long time.
C.The word 'volcano' comes from the Roman god of fire, Vulcan.
D.Many people like to visit and hike on old volcanoes.
Challenging
Read these three supporting details: (1) The Moon has no air for us to breathe. (2) There is no liquid water on the Moon's surface. (3) The Moon gets very hot during the day and very cold at night. What is the BEST main idea for these details?
A.The Moon is very far away from Earth.
B.The Moon is smaller than the Earth.
C.Astronauts have walked on the Moon.
D.The Moon is not a place where humans could easily live.
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