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In an odd-one-out question, three numbers belong together and one does not. Check simple properties one by one: even or odd, prime, square, or in the same times table.
✓ You passed this lesson’s test.
Test every number — “find what three numbers share; the one left out is the answer”
Use it for: Classification questions in Olympiads and aptitude tests, and practice with primes, squares and times tables.
Check: 57 ÷ 3 = 19, while 17, 59 and 71 divide only by 1 and themselves ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🕵️ Odd-One Detective badge when you pass — and a certificate when you finish all 10 lessons of Part 1 · Patterns. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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