Main Idea — Grade 3 ELA 練習ワークシート
The main idea is what a paragraph or passage is mostly about — the central point the author wants you to understand. It is often stated in a topic sentence, usually at the beginning or end of a paragraph.
Supporting details are facts, examples, or descriptions that explain or prove the main idea. They answer questions like who, what, when, where, why, and how.
To find the main idea, ask: "What is this mostly about?" Then check which details fit under that umbrella. Details that don't support the main idea are off-topic.
練習するスキル
- Identifying main ideas in paragraphs
- Distinguishing main ideas from supporting details
- Finding topic sentences
- Summarizing in one sentence
練習ワークシート：Main Idea
指示： 各問題を丁寧に解きましょう。途中式もはっきりと書きましょう。最終的な答えは、指定された場所または指示に従って別の用紙に書いてください。
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1.The sun is very hot. It gives us light and warmth. Plants need sunlight to grow. People and animals need the sun to live. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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2.At the park, children play on the swings. Some kids slide down the slide. Others throw a ball. Everyone is having fun. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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3.Birds build nests in trees. They use twigs and grass. Some birds use mud. Nests keep eggs safe. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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4.My dog likes to run. He chases his tail. He plays fetch with a stick. He is very happy when we go outside. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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5.Apples grow on trees. They can be red, green, or yellow. Some apples are sweet. Others are sour. You can eat them fresh or make pie. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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6.In winter, it is cold. Snow falls from the sky. People wear warm coats. They build snowmen and drink hot chocolate. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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7.Books can take you to new places. You can read about faraway lands. You can learn about dinosaurs. You can meet brave heroes. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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8.The ocean is very big. It has salty water. Many fish live there. Whales and dolphins swim in the ocean too. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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9.My teacher helps me learn. She reads stories to us. She shows us how to add numbers. She is kind and patient. What is the main idea of this passage?
Main Idea — 練習ワークシート（続き）
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10.In spring, flowers bloom. The weather gets warmer. Birds sing in the trees. Baby animals are born. What is the main idea of this passage?
解答集
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1.
最終回答： The main idea is that the sun is important because it gives light, warmth, and helps things grow.
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2.
最終回答： The main idea is that children are having fun playing at the park.
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3.
最終回答： The main idea is that birds build nests to keep their eggs safe.
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4.
最終回答： The main idea is that the dog likes to run and play outside.
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5.
最終回答： The main idea is that apples come in different colors and can be eaten in different ways.
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6.
最終回答： The main idea is that winter is cold and people enjoy winter activities.
解答集（続き）
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7.
最終回答： The main idea is that books let you explore new places and learn new things.
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8.
最終回答： The main idea is that the ocean is big and full of life.
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9.
最終回答： The main idea is that the teacher helps students learn and is kind.
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10.
最終回答： The main idea is that spring brings warmer weather, flowers, and new life.
避けるべきよくある間違い
- Choosing a detail instead of the overall main idea
- Picking a topic that is too broad or too narrow
- Ignoring repeated ideas across sentences
- Confusing the title with the main idea
自分だけのワークシートを作成
好きな難易度でmain ideaの問題を新しく作成したいですか？WorksheetSmithを使えば、印刷可能なカスタムPDFを数秒で作成できます。
最終更新：2026