Should I write decimals with a point or comma?

IELTS answer keys typically use a full stop (3.5). Match the form shown in practice materials for your test centre.

What if the speaker says point five?

Convert to standard notation: 0.5 unless context implies 3 point 5 (3.5). Use surrounding words (metres, percent, million).

Are decimal traps only in Section 1?

No—statistics, prices, and measurements appear in later sections too.

Compound Noun Traps in IELTS Listening

Numbers · Measurements · May 2026

Direct answer

Decimal point traps turn a heard number into a wrong magnitude. Speakers say “three point five,” “nought point eight,” or “point seventy-five,” and students write 35, 8, or 75 instead of 3.5, 0.8, or 0.75. Under one-play audio, the trap is not maths—it is mapping spoken English number patterns to the exact digits the answer key expects.

Why compounds appear in Listening

Note completion tests fixed lexical chunks. Spoken English smears boundaries; IELTS tests the standard written chunk.

Point-first speech “Point five” → 0.5, not 5

Embedded decimals “Three point five metres” → 3.5

Double digits “Thirty-five” vs “three five” after a decimal cue

Compound patterns that repeat

What you hear	Wrong write	Correct logic
Three point five	35 or 3.5m as words	3.5 — use unit words as confirmation
Nought point eight / oh point eight	8	0.8
Two and a half	2.5 vs 2/5 confusion	2.5 for measurements; fractions only if asked

Pair with hyphenation traps and form completion traps.

Framework: unit check before you move on

1. Pre-read the gap type

Metres, kilograms, percent, and million signal decimal scale.

2. Echo silently

When you hear “point,” write the dot immediately—then add digits.

3. Sanity-check magnitude

Would 35 km make sense for a walking route? If not, revisit 3.5.

4. Drill number formats

Transcript review for point-first and nought-point patterns weekly.

Key takeaways

Decimal traps change magnitude—not just spelling.
“Point” almost always means a decimal dot in IELTS answers.
Use units and context to verify before the next question plays.
Drill spoken formats in transcript review, not only gap-fill tests.

FAQ

IELTS keys typically use a full stop (3.5). Match practice materials for your test format.

Usually 0.5 unless context clearly gives a whole number before point (e.g. three point five = 3.5).

No—statistics, prices, and measurements appear across all Listening sections.

Find which Listening vocabulary trap costs you most bands.

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