Keystones — Lintel
Five GCSE retrieval questions · 1 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0087
Answer: 8.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 29°. Find adjacent side
Answer: 23.6cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 22, 8, 47, 46, 7, 40, 23
Answer: 27.6