Keystones — Lintel
Five GCSE retrieval questions · 14 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00095
Answer: 9.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 45°. Find adjacent side
Answer: 21.2cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
Calculate the mean of: 45, 47, 38, 21, 25, 5, 12
Answer: 27.6