Skimming & scanning: read less, find more

The single biggest mistake in IELTS Reading is trying to read every word. You have roughly 20 minutes per passage and around 700-900 words to handle, so careful reading of the whole text is impossible. Instead you use three gears: skimming for the gist, scanning for facts, and close reading for the two or three sentences that actually contain an answer. The art is switching between them at the right moment - and they are not the same thing.

Skimming vs scanning vs close reading

• Skimming = reading fast for the main idea. Your eyes glide; you read the title, the first and last sentence of each paragraph, and any words in bold or italics. Goal: a mental map of "what is each paragraph roughly about?"
• Scanning = hunting for one specific thing. You ignore meaning entirely and let your eyes sweep the page for a visual target: a name, a date, a number, a capitalised word, a word in italics. Goal: locate, then stop.
• Close reading = the slow gear you drop into only once scanning has parked you on the right lines. You read those few sentences word by word, because that is where marks are won or lost.

The method, step by step

1. Skim the whole passage in ~2 minutes. Don't stop at hard words. Jot a two- or three-word label beside each paragraph (e.g. "A = causes", "B = 1850s discovery", "C = modern uses").
2. Read the question and underline the keyword you'll hunt for - usually a noun, name or number that is unlikely to be reworded.
3. Decide your anchor. Names, dates, numbers, places and technical terms stay the same in the text, so they make the best scanning targets. Common verbs and adjectives get paraphrased, so they make poor ones.
4. Scan back into the passage for that anchor (or a close synonym). Move your eyes in a fast vertical sweep, not line by line. When you hit the anchor, slow down to close reading.
5. Answer, then move on. Never re-skim the whole text per question - your paragraph labels tell you roughly where to look.

Scanning tactics that actually save time

• Number questions are the fastest of all. Digits, dates and percentages stand out visually; let your eye catch the shape of them.
• Use the question order. Most question sets follow the passage top-to-bottom, so the next answer is usually below the last one you found. Don't restart at paragraph A every time.
• Anticipate the paraphrase. Before scanning, ask "how else might this be said?" A question about "the cost" may appear as price, expense, fee, outlay. Hold two or three synonyms in mind as you sweep.

Worked example 1 - a calculated date

The Lighthouse Keepers - Paragraph C. For over two centuries the Eddystone rocks claimed ships almost yearly. The first tower, completed in 1698 by Henry Winstanley, was swept away in a storm five years later. Its replacement, built largely of wood, burned down in 1755.

Question: In which year was the first Eddystone tower destroyed?

• Skim told you Paragraph C is "about the towers' history" - so you go there.
• Scan for the number/date clue. You see "1698... swept away five years later".
• Close read: 1698 + 5 = 1703. The answer isn't stated as a year - it's calculated. Scanning got you to the spot; close reading got you the answer.

Worked example 2 - choosing the right anchor

Coral reefs - Paragraph E. Although reefs occupy less than one per cent of the ocean floor, they shelter roughly a quarter of all marine species. This extraordinary biodiversity is now under threat: rising sea temperatures cause the algae living inside coral to be expelled, a process known as bleaching.

Question: What proportion of marine species do reefs support?

• The eye-catching verb is "shelter", but that will probably be paraphrased ("support", "are home to"). A weak scanner hunts for "support" and finds nothing.
• The smart anchor is the fraction - "a quarter" / "25%". Scan for the number shape.
• Close read confirms the meaning: reefs "shelter roughly a quarter of all marine species". Answer: a quarter (25%). The anchor was the number, not the verb.

Common mistakes

• Synonym swaps. The question rarely uses the passage's exact words. "Destroyed" appears as "swept away" / "burned down"; "support" appears as "shelter". Scan for the factual anchor (a date, a name, a number), not the verb or adjective.
• Skimming when you should scan. If a question asks for a specific detail, don't re-read whole paragraphs for meaning - sweep for the anchor word, then drop into close reading.
• Scanning when you should skim. Matching headings and main idea questions need the gist; sweeping for a single word will mislead you, because the keyword may sit in a paragraph that is about something else.
• Reading the answer lines too fast. Once scanning lands you on the spot, people stay in skim gear and grab the first plausible word. Slow right down for those two or three sentences.
• Ignoring "five years later", "the following decade", "by then". Relative time and quantity phrases hide calculated answers; treat them as a signal to do the arithmetic, not to move on.

Try it

Open a passage at /ielts/reading. Give yourself 120 seconds to skim and label every paragraph before you look at the questions. Then, for each question, write down your anchor word (the name/date/number you'll scan for) before you start sweeping. Answer using scanning + close reading only - and notice how rarely you need to read a paragraph in full.