How to Answer 11+ Odd One Out Questions

An odd one out question gives you four or five words and asks which one does not belong. It tests whether you can spot the category hiding behind a list — fruits, tools, string instruments, words that mean "huge" — and then notice the single word standing outside it.

In the formats used in UK 11+ entrance exams, the question itself never changes: "Which word is the odd one out?" All the difficulty lives in the words. Easy questions use everyday things like fruit and furniture; hard ones use categories you have to know (brass versus strings, 2-D versus 3-D) or vocabulary where one word quietly means the reverse of the rest.

Children find this type friendly because there is nothing to decode — but it punishes guessing more than any other word question. The wrong options are all nearly a family, and the word that merely looks different is almost never the answer. What wins is a rule you can say out loud, tested on every single word.

The method

1. Read every word before deciding anything. The odd one out only exists once you've seen the whole list.
2. Find the job most of the words share. Things you wear, ways to move, feelings, units of length — the family that covers most of the list.
3. Say the rule as a full sentence. Not "they're all sort of tools" but "these are all tools you hold to do a job." Vague rules let traps in; sentences keep you honest.
4. Test the rule on every word. Your rule should catch exactly one rule-breaker. That word is the answer.
5. If it knocks out two words — or none — your rule is wrong. Don't force it. Find a sharper rule and test again.

Worked examples

Example 1 — warm-up

Which word is the odd one out?

A. hammer B. saw C. chisel D. nail

1. First rule attempt: "they're all in a toolbox." Test it — all four pass, nobody's out. Too loose.
2. Sharper rule: "these are tools you hold to do the work." Hammer yes, saw yes, chisel yes… nail no — a nail is the thing the tools are used ON.
3. One rule-breaker exactly. That's the answer.

Answer: nail

Example 2 — medium

Which word is the odd one out?

A. violin B. trumpet C. guitar D. harp E. cello

1. First rule: "all musical instruments." True of all five — catches nobody. Sharpen.
2. Look closer at how they make sound: violin, guitar, harp and cello all have strings. A trumpet is brass — you blow it.
3. New rule: "instruments played with strings." It knocks out exactly one.

Answer: trumpet

Example 3 — harder

Which word is the odd one out?

A. enormous B. gigantic C. vast D. minute E. immense

1. This time the family is a meaning: enormous, gigantic, vast and immense all mean extremely large.
2. "Minute" looks like the clock word — but said my-NEWT it means extremely small, the exact reverse of the others.
3. Rule: "words meaning huge." One word breaks it.

Answer: minute

The traps

The loose rule. "They all belong in a toolbox" catches nothing; "they're all instruments" catches nothing. If your rule doesn't knock out exactly one word, it isn't the exam's rule yet. Sharpen until it does.

The looks-different trap. The longest word, the strangest spelling, the only word you don't recognise — none of these make a word the odd one out. Only meaning does. (In Example 3 the "odd-looking" answer is right, but only because its meaning breaks the rule.)

The thing-versus-doer trap. Watch for a list where one word is what the others act on or belong to: the nail among the tools, an author among kinds of writing, a room among furniture. Everything shares a scene — but one word plays a different part in it.

First-idea lock-in. Committing to the first word that feels odd, then bending the rule to fit. The method runs the other way: rule first, tested on all the words — then the answer falls out on its own.

Try these yourself

1.

Which word is the odd one out?

A. table B. chair C. sofa D. kitchen E. bed

2.

Which word is the odd one out?

A. centimetre B. litre C. metre D. kilometre

3.

Which word is the odd one out?

A. adder B. cobra C. python D. gecko

Answers

1. D — table, chair, sofa and bed are pieces of furniture; a kitchen is the room they might stand in.
2. B — centimetre, metre and kilometre measure length; a litre measures volume.
3. D — adder, cobra and python are snakes; a gecko is a lizard.

Related

• The complete 11+ question-type guide
• VR: Synonyms — the vocabulary that powers meaning-based rules
• VR: Antonyms — spotting the word that means the reverse

All example questions come from the Brainblox question bank — practise this question type inside 15 arcade games, timed mock exams and focused practice. Brainblox is an independent app: not affiliated with, endorsed by or licensed by any exam board, school or assessment publisher, and it contains no past papers.