Keystones — Lintel
Five GCSE retrieval questions · 20 February 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
720000
Answer: 7.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 49°. Find opposite
Answer: 20.7cm -
4. Ratio Mixed ratio problems
Express the first part of 5:2 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 40, 35, 48, 34, 20, 21, 5, 18
Answer: 27.6