Keystones — Lintel
Five GCSE retrieval questions · 28 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
78000000
Answer: 7.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 28°. Find adjacent side
Answer: 21.2cm -
4. Ratio Mixed ratio problems
In ratio 3:4:1, what fraction is the second part?
Answer: 4⁄8 -
5. Statistics Mean
Calculate the mean of: 10, 24, 19, 46, 24, 21, 31
Answer: 25