Keystones — Lintel
Five GCSE retrieval questions · 10 April 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0004
Answer: 4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 36°. Find opposite
Answer: 12.4cm -
4. Ratio Mixed ratio problems
Simplify: 24:12:20
Answer: 6:3:5 -
5. Statistics Mean
Calculate the mean of: 50, 27, 50, 12, 44, 6, 8, 40
Answer: 29.6