Keystones — Lintel
Five GCSE retrieval questions · 21 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.087
Answer: 8.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 54°. Find opposite
Answer: 33cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
Calculate the mean of: 25, 8, 9, 34, 25, 45
Answer: 24.3