Main idea of a short academic text (SAT)

Reading Comprehension

CCSS RI.11-12.2CCSS RL.11-12.2England: SAT Reading and Writing (Central Ideas and Details)England: ACT Reading

Objective and success criteria

Students will: Main idea of a short academic text (SAT).

I can answer questions on today's skill on my own, without help.
I can explain each step and say why it works.
I can check my answer and spot a mistake.

Before and after

Needs first: Central ideas in complex texts; Why did the author include this detail?

Leads to: the next skill in this area.

Materials: A short text or extract (one copy each), Highlighters, Question cards, Mini whiteboards, A short model text on the board, Printed student sheet (below).

Warm-up · 6 min

Quick retrieval from earlier learning (Central ideas in complex texts; Why did the author include this detail?). Students answer on mini whiteboards.
Show answers together and note who needs support in the main task.

Is the proposed answer correct? The new bridge was hailed as a triumph of engineering. Within a week, however, it had begun to sway alarmingly in the wind, and engineers closed it for repairs. Why does the writer mention that the bridge was 'hailed as a triumph'? → to praise the engineers' repairs (yes, it is correct / no, it is not correct) → no, it is not correctPrompt: Ask: what would be lost if this detail were removed?
For centuries, lighthouses guided ships with flame and later electric lamps. Satellite navigation has made many of them technically unnecessary. Yet communities have fought to preserve them, not for their function but for what they represent: safety, history and a sense of place. Which choice best states the central idea? (Ships no longer sail near coasts. / Lighthouses used flames. / Satellite navigation is unreliable. / Although lighthouses are less needed for navigation, people value them for their symbolic and historical meaning.) → Although lighthouses are less needed for navigation, people value them for their symbolic and historical meaning.Prompt: What is the WHOLE text mostly about, not just one part?
Is the proposed answer correct? Scientists studying the Arctic fox noticed something odd: one fox had walked more than 3,500 kilometres in 76 days, from Norway to Canada. What is the main purpose of the specific figures? → to make the fox's journey vivid and impressive (yes, it is correct / no, it is not correct) → yes, it is correctPrompt: Ask: what would be lost if this detail were removed?

Hook · 6 min

Read the first lines of a short text aloud and ask what students predict will happen and why.
Share the objective: Main idea of a short academic text (SAT). Read the success criteria together.

I do: model it · 12 min

Work through the example out loud, saying why you do each step, not just what you do.
Example: For decades, researchers assumed that octopuses, being solitary, had little need for complex social behaviour. However, divers off the coast of Australia have recorded groups of gloomy octopuses living together, sharing dens and even signalling to one another by changing colour. These observations suggest that octopus social life may be richer than once believed. Which choice best states the main idea of the text?
Step 1: The main idea is the central claim the whole text supports; details are evidence for it.
Step 2: The text sets up an old assumption and presents evidence against it.
Step 3: So the answer is: New observations challenge the view that octopuses have little social behaviour.
Answer: New observations challenge the view that octopuses have little social behaviour.
Pause after each step and ask a student to say what comes next.

We do: guided practice · 12 min

Do these together. Students try each step on whiteboards before you reveal it.
Use the hints as prompts rather than giving the answer.

In many cities, the hottest neighbourhoods are those with the fewest trees and the most paved surfaces. Researchers in several countries have found that planting street trees and adding green roofs can lower local summer temperatures by several degrees, reducing health risks during heatwaves. Which choice best states the main idea of the text? (Green roofs are difficult to build. / Adding greenery to cities can cool hot neighbourhoods and reduce heat-related risks. / Heatwaves only happen in large cities. / Paved surfaces are cheaper than trees.) → Adding greenery to cities can cool hot neighbourhoods and reduce heat-related risks.Prompt: Which choice covers the WHOLE text, not just one detail?
Before the printing press, books were copied by hand, which could take months. Printing made books far cheaper and faster to produce, helping ideas spread across Europe. Which choice best states the main idea of the text? (The printing press made books cheaper and helped ideas spread. / Books took months to read. / Europe had few books. / Copying by hand was a popular hobby.) → The printing press made books cheaper and helped ideas spread.Prompt: What is the text mostly about?

You do: independent practice · 17 min

Students work on the student sheet. Circulate and check the first two answers of every student early.
Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

Exit ticket · 7 min

Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.

Some species of trees share nutrients through underground networks of fungi. Through these networks, larger trees can pass sugars to young seedlings growing in the shade. Which choice best states the main idea of the text? (Fungi are a type of tree. / Seedlings prefer the shade. / Sugar is bad for trees. / Trees can share nutrients with each other through fungal networks.) → Trees can share nutrients with each other through fungal networks.Prompt: What is the text mostly about?
Many people believe that the 'five-second rule' protects food dropped on the floor. In an experiment, scientists dropped foods onto surfaces contaminated with bacteria and measured how much transferred. Bacteria reached wet foods like watermelon in under a second, though dry foods such as sweets picked up fewer bacteria over time. Which choice best states the main idea of the text? (Scientists enjoy dropping food. / Watermelon is healthier than sweets. / Floors are always clean enough to eat from. / An experiment shows bacteria can transfer to dropped food almost instantly, especially to wet foods.) → An experiment shows bacteria can transfer to dropped food almost instantly, especially to wet foods.Prompt: Which choice covers the WHOLE text, not just one detail?

Watch out for

Answering from memory or opinion instead of evidence in the text.
Copying a long quote without explaining what it shows.

Support and stretch

Support

Review first: Central ideas in complex texts.
Use concrete materials: a short text or extract (one copy each).
Give the first step of each question, or a partly worked example to finish.
Pair with a confident partner for the guided practice.

Stretch

Explain a common mistake in writing and how to fix it.
Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/english/grade-11.

Free lesson plan from eurekami.com/lesson-plan-builder

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Main idea of a short academic text (SAT)

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Date

Score/ 8

Two Views on AI and Art

Text 1. When photography was invented, some painters declared that art was dead. Instead, painting changed: freed from the need to record reality, artists explored colour, emotion and abstraction. Image-generating AI may play a similar role. Used as a tool, it can help people sketch ideas quickly, test compositions and bring visual thinking to those who never trained as artists. The question is not whether AI will end art, but what new kinds of art people will make with it. Text 2. Comparisons with photography are tempting but misleading. A camera records the world; many AI image tools are trained on millions of existing artworks, often without their creators' permission or payment. Until artists can choose whether their work is used, and are fairly credited, it is hard to call this simply a new tool. The problem is not the technology itself but the way it has been built.

1
Question 1
Read "Two Views on AI and Art". Which choice best states the main idea of Text 1?
- A. AI will soon replace all artists.
- B. Photography destroyed painting.
- C. Only trained artists should make images.
- D. Like photography, AI may change art rather than end it, acting as a new creative tool.

2
Question 2
For decades, researchers assumed that octopuses, being solitary, had little need for complex social behaviour. However, divers off the coast of Australia have recorded groups of gloomy octopuses living together, sharing dens and even signalling to one another by changing colour. These observations suggest that octopus social life may be richer than once believed. Which choice best states the main idea of the text?
- A. Divers have discovered a new species of octopus.
- B. New observations challenge the view that octopuses have little social behaviour.
- C. Australia has more octopuses than any other country.
- D. Octopuses change colour to hide from predators.
3
Question 3
Some species of trees share nutrients through underground networks of fungi. Through these networks, larger trees can pass sugars to young seedlings growing in the shade. Which choice best states the main idea of the text?
- A. Sugar is bad for trees.
- B. Fungi are a type of tree.
- C. Seedlings prefer the shade.
- D. Trees can share nutrients with each other through fungal networks.

Beavers Come Home

Four hundred years after they were hunted to extinction in Britain, beavers are back. Small populations now live wild in parts of Scotland and England, and several other European countries have reintroduced them too. Ecologists describe beavers as "ecosystem engineers". By building dams, they create ponds and wetlands that slow the flow of water, trap sediment and provide homes for insects, amphibians and birds. In one Devon study, the amount of water flowing downstream during heavy rain was noticeably lower below beaver dams than above them, suggesting that dams can help reduce flooding. Not everyone is delighted. Some farmers report flooded fields and felled trees, and they worry about the cost. Their concerns are real, and schemes in some areas now compensate landowners or move beavers whose dams cause serious damage. Supporters argue that the benefits outweigh the costs. Wetlands created by beavers can store water during droughts, improve water quality and attract visitors. Yet researchers caution that results vary from river to river, and long-term data are still limited. What is clear is that the return of beavers forces us to ask a broader question: how much room are we willing to make for wild animals in a crowded country?

4
Question 4
Read "Beavers Come Home". Which choice best states the main idea of the text?
- A. Reintroduced beavers bring environmental benefits but also costs, and the full picture is still being studied.
- B. Farmers are always opposed to wildlife.
- C. Beavers should be removed from Britain again.
- D. Beavers only live in Scotland.

5
Question 5
Many people believe that the 'five-second rule' protects food dropped on the floor. In an experiment, scientists dropped foods onto surfaces contaminated with bacteria and measured how much transferred. Bacteria reached wet foods like watermelon in under a second, though dry foods such as sweets picked up fewer bacteria over time. Which choice best states the main idea of the text?
- A. Floors are always clean enough to eat from.
- B. Scientists enjoy dropping food.
- C. An experiment shows bacteria can transfer to dropped food almost instantly, especially to wet foods.
- D. Watermelon is healthier than sweets.
6
Question 6
Honeybees perform a 'waggle dance' to tell other bees where food is. The angle of the dance shows the direction of the food relative to the sun, and the length of the waggle shows the distance. Which choice best states the main idea of the text?
- A. Food is often far from the hive.
- B. Honeybees like the sun.
- C. Bees dance for fun.
- D. Honeybees communicate the location of food through a dance.
7
Question 7
The architect Diébédo Francis Kéré grew up in Gando, Burkina Faso, where his school was a hot, dark concrete building. When he returned as an architect, he designed a new school using local clay bricks and a raised, ventilated roof that kept classrooms cool without air conditioning. The project, built with the help of villagers, became a model for sustainable design. Which choice best states the main idea of the text?
- A. Burkina Faso has many architects.
- B. Kéré disliked going to school as a child.
- C. Kéré designed a school that uses local materials and clever design to stay cool, and it became a model of sustainability.
- D. Concrete is the best material for hot climates.
8
Question 8
Before the printing press, books were copied by hand, which could take months. Printing made books far cheaper and faster to produce, helping ideas spread across Europe. Which choice best states the main idea of the text?
- A. Copying by hand was a popular hobby.
- B. The printing press made books cheaper and helped ideas spread.
- C. Books took months to read.
- D. Europe had few books.

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Answer key: Main idea of a short academic text (SAT)

1. D. Like photography, AI may change art rather than end it, acting as a new creative tool.
2. B. New observations challenge the view that octopuses have little social behaviour.
3. D. Trees can share nutrients with each other through fungal networks.
4. A. Reintroduced beavers bring environmental benefits but also costs, and the full picture is still being studied.
5. C. An experiment shows bacteria can transfer to dropped food almost instantly, especially to wet foods.
6. D. Honeybees communicate the location of food through a dance.
7. C. Kéré designed a school that uses local materials and clever design to stay cool, and it became a model of sustainability.
8. B. The printing press made books cheaper and helped ideas spread.