Keystones — Lintel
Five GCSE retrieval questions · 24 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0042
Answer: 4.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 52°. Find opposite
Answer: 33.3cm -
4. Ratio Mixed ratio problems
£400.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £150.00 -
5. Statistics Mean
Calculate the mean of: 45, 33, 34, 14, 7, 45, 24
Answer: 28.9