The Maths Trick That Always Ends in 4! | Maths Extension Activity for High-Potential Students
Looking for an engaging maths challenge for high-potential learners in primary school? This simple number trick is a fantastic way to introduce mathematical reasoning, algebraic thinking, pattern recognition and problem-solving.
Ask students to:
- Think of any number.
- Double it.
- Add 8.
- Halve it.
- Subtract their starting number.
The answer is always 4! But the real challenge is explaining why it works.
Extend the activity by asking students to test negative numbers, decimals and large numbers, prove the mathematical pattern, or invent their own number trick that always produces a chosen answer.
Perfect for primary maths extension, gifted and talented education, HPGE enrichment, early algebra, mathematical investigations, fast finishers and open-ended classroom challenges.
At Depth Education, we believe high-potential students need opportunities to think deeply, question patterns and explore ideas — not simply complete more work.






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