The main idea is the one point a paragraph exists to make. Supporting detail is the evidence, example or explanation that backs it up, and a good summary keeps the first and compresses the second.
How do you find the main idea?
Use the cover-the-examples test. Read the paragraph, then mentally cover every example, number and name. What point is left standing?
Check your answer by asking whether the other sentences explain, prove or illustrate it. If they do, you have the main idea.
Worked example
This is an original paragraph about a school recycling project.
The recycling project at SMK Bukit Indah reduced the school’s waste sharply. In the first term, each class sorted paper and plastic into separate bins. The canteen switched from polystyrene boxes to reusable trays. By the end of the year, the general waste bin was collected twice a week instead of daily.
Cover the examples: sorting bins, reusable trays, collection frequency. What is left is the first sentence, which says the project reduced waste sharply. The other three sentences show how.
| Sentence | Role |
|---|---|
| Project reduced waste sharply | Main idea |
| Classes sorted paper and plastic | Supporting detail: method |
| Canteen switched to reusable trays | Supporting detail: method |
| Collection fell from daily to twice a week | Supporting detail: evidence |
A good one-sentence summary is: “The recycling project reduced the school’s waste through sorting and reusable trays.”
What does the common mistake look like?
A student writes: “The recycling project at SMK Bukit Indah made each class sort paper and plastic and the canteen changed to reusable trays and the bin was collected twice a week.” Every fact is correct, but the summary is a list of details with no point.
The student has treated every sentence as equally important. The repair is to state the point first, then add only as much detail as the word limit allows.
Steps to follow
- Read the paragraph once without marking anything.
- Cover the examples and find the sentence or idea that remains.
- Write it in your own words, then add one supporting detail if space allows.
Self-check
Find the main idea in this original paragraph, then say which sentences are only supporting detail.
Reading on a phone at night can make it harder to fall asleep. The screen gives off bright light that tells the brain it is still daytime. One student in a class survey said she took an hour to fall asleep after scrolling. Switching the screen off thirty minutes before bed is a simple way to reduce the problem.
Answer
Main idea: reading on a phone at night can make it harder to fall asleep (sentence 1). Sentence 2 is supporting detail that explains why.
Sentence 3 is an example from one student. Sentence 4 is a suggested solution, which supports the point by showing what to do. A summary would be: “Phone screens at night delay sleep, so switching them off earlier helps.”
Where to go next
Main idea work depends on understanding every sentence, so if a word blocks you, try explaining a word using context. Summary tasks in Bahasa Melayu use this skill in the rumusan paper. The reading foundations hub lists the other repair skills.