Keystones — Lintel
Five GCSE retrieval questions · 11 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00081
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 36°. Find opposite
Answer: 8.7cm -
4. Ratio Mixed ratio problems
£350.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £100.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 46, 37, 23, what is the missing number?
Answer: 46