Page 1 · Introduction
The big picture
The main idea is what a passage is mostly about — the big picture. It’s not one tiny detail; it’s the whole point. Learning to spot it helps you understand everything you read.
The big ideaAsk yourself: ‘What is this whole passage mostly about?’ The main idea covers the whole text, not just one sentence. A good title matches the main idea.
💡We practise finding the big picture. Watch out for answers that are true but only about one small part — those are traps!
On the real testWhere this appearsMain idea questions are common in the Reading part of the OC test (sat in Year 4). Think about the whole passage, not just one line.
Page 2 · Mostly about
What is it mostly about?
The main idea is the thing most of the sentences are about.
“Dogs make wonderful pets. They are loyal, playful and love their owners. Many families choose a dog as their first pet.” What is this mostly about?
Every sentence is about dogs as pets. That’s the main idea.
Dogs make good pets
Page 3 · Too small
Watch for detail traps
Some answers are true but only about one small part. The main idea must cover the whole passage.
“Bees are important. They make honey, and they help flowers grow by carrying pollen. Without bees, many plants could not make seeds.” Main idea?
‘Bees make honey’ is true but too small. The whole passage is about why bees are important.
Bees are important
Page 4 · Best title
A good title fits the main idea
A good title matches the main idea — not too narrow, not about just one detail.
“The sun gives us light and warmth. Plants need it to grow. Without the sun, there would be no life on Earth.” Best title?
The passage is about why the sun matters. A good title: ‘Why the Sun is Important’.
Why the Sun is Important
Level 1 · Easy
Warm up
What is it mostly about? Tap to check.
1. “Sharks live in the ocean. They are strong swimmers and have many sharp teeth. Some sharks are very large.” What is this mostly about?
A Sharp teeth
B Sharks
C The ocean
D Swimming
Every sentence is about sharks — that’s the main idea.
2. “Rain helps plants grow. It fills our rivers and lakes. We need rain for fresh water to drink.” What is this mostly about?
A Rivers
B Drinking
C Why rain is useful
D Plants
The whole passage is about why rain is useful.
3. “Libraries are quiet places full of books. You can borrow books to read at home. Many libraries also have computers.” What is this mostly about?
A Computers
B Libraries
C Reading at home
D Quiet places
The passage is mostly about libraries.
Level 2 · Medium
Building up
Find the big picture.
1. “Brushing your teeth keeps them clean. It stops holes forming. Dentists say to brush twice a day.” Main idea?
A Dentists
B Looking after your teeth
C Twice a day
D Holes
The whole passage is about looking after your teeth.
2. “Penguins live in cold places. They have thick feathers to stay warm and huddle together in groups.” Main idea?
A How penguins stay warm
B Feathers
C Groups
D Cold places
The passage is about how penguins keep warm.
3. “Exercise is good for you. It makes your body strong, helps you sleep, and puts you in a good mood.” Main idea?
A Sleep
B A good mood
C Why exercise is good for you
D Strong bodies
The whole passage is about why exercise is good for you.
Level 3 · Hard
Getting tougher
Avoid the detail traps.
1. “Recycling helps our planet. It saves trees, keeps rubbish out of the sea, and uses less energy. Everyone can help by sorting their rubbish.” Main idea?
A Sorting rubbish
B Saving trees
C Why recycling helps the planet
D The sea
‘Saving trees’ is just one detail. The big picture is why recycling helps the planet.
2. “The spider spins a web to catch food. First it makes a frame, then fills it with sticky threads. When an insect lands, the spider feels it move.” Main idea?
A How a spider makes and uses its web
B Sticky threads
C Insects
D The frame
The passage explains how a spider makes and uses its web.
3. “Water can be a solid, a liquid or a gas. Ice is solid water. When it melts it becomes liquid. When it boils it turns into steam, which is a gas.” Main idea?
A Ice
B Steam
C The three forms of water
D Boiling
The whole passage is about the three forms water can take.
Level 4 · Challenge
Challenge
Choose the best title.
1. “Ants are tiny but very strong. They can lift things much heavier than themselves. They work together to carry food back to their nest.” Best title?
A Tiny Ants and Their Strength
B Nests
C Food
D Lifting
The passage is about how strong ants are, so this title fits best.
2. “Long ago, people had no fridges. They kept food cool in cellars, salted meat to save it, and dried fruit in the sun.” Best title?
A Cellars
B How People Kept Food Fresh Long Ago
C Salt
D Fruit
The whole passage is about how people kept food fresh before fridges.
3. “The rainforest is full of life. Colourful birds fly above, monkeys swing through trees, and insects crawl on the ground. It is one of the busiest places on Earth.” Best title?
A Insects
B Life in the Rainforest
C Birds
D Trees
The passage is about all the life in the rainforest, so this title fits best.
Page 9 · Well done
You’ve finished Main Idea
You can now find the main idea — the big picture of what a passage is mostly about — and spot a good title. Remember to avoid the traps that are true but only about one small part.
RememberAsk: ‘What is the whole passage mostly about?’ The main idea covers everything, not just one detail. A good title matches it.
🎉Great work! Try another module next — every one helps you get ready.
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