Keystones — Lintel
Five GCSE retrieval questions · 19 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00048
Answer: 4.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 56°. Find adjacent side
Answer: 15.cm -
4. Ratio Mixed ratio problems
£245.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £70.00 -
5. Statistics Mean
Calculate the mean of: 44, 18, 34, 46, 17, 13
Answer: 28.7