Keystones — Lintel
Five GCSE retrieval questions · 5 September 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.082
Answer: 8.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 29°. Find adjacent side
Answer: 33.2cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
Calculate the mean of: 39, 44, 45, 46, 19, 48, 29, 31
Answer: 37.6