Keystones — Lintel
Five GCSE retrieval questions · 27 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
21000000
Answer: 2.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 65°. Find adjacent side
Answer: 10.6cm -
4. Ratio Mixed ratio problems
In ratio 1:3:4, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
Calculate the mean of: 32, 23, 11, 24, 42, 14
Answer: 24.3