Keystones — Lintel
Five GCSE retrieval questions · 19 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0054
Answer: 5.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 32°. Find opposite
Answer: 16.9cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
Calculate the mean of: 13, 8, 42, 8, 14, 17, 9, 50
Answer: 20.1