Ages 13–18
BrainteenAges 12–16PuzzlesPuzzle
Odd one out (Tricky)
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Find the number that does not belong with the other three.
Curriculum links
- Common Core 4.OA.B.4: Find factor pairs for whole numbers up to 100, recognise multiples, and decide whether a number is prime or composite.
- England NC Y5.MA.MD.1: Identify multiples and factors, including all factor pairs of a number and common factors of two numbers.
- England NC Y5.MA.MD.8: Recognise and use square numbers and cube numbers, and the notation for squared (²) and cubed (³).
- BNCC EF06MA05: Classify numbers as prime or composite, use "multiple of", "divisor of" and "factor of", and find divisibility rules.
- Programmes FR C3.MA.NC.4: Recognise multiples and divisors and use divisibility rules (2, 3, 4, 5, 9, 10).
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About this activity
What your child practises
Skills: Odd one out: number properties (level 2).
Logical reasoning, patience and step-by-step problem solving.
What’s included
- 15 questions
- An answer key you can print with the sheet or on its own
- An on-screen version with instant marking and stars
Age and school year
Made for ages 12–16. That’s Grade 7–11 in the US, Year 8–12 in England, JSS 1 – SS 2 in Nigeria and Class 7–11 in India.
How to use it
- Print it at home or school – it fits a standard A4 or US Letter page.
- Print the answer key too, so marking takes seconds.
- Play it on screen: answers are marked instantly and children earn stars.
- Write on it on a tablet or touchscreen with a finger or stylus – no printer needed.
Tips for parents and teachers
- Solve the first part together while thinking aloud about your strategy, then hand over the pencil.
- Puzzles make great early-finisher or calm-down activities – keep a few printed copies in a folder.
- Combine this sheet with past exam questions on the same topic for mixed, exam-style practice.
Good to know
- Time needed
- About 5–10 minutes
- You’ll need
- A printer (or a tablet to work on screen), a pencil and an eraser
- Difficulty
- On level (Tricky) – pitched at ages 12–16
- Answer key
- Yes – print it with the sheet or on its own