Keystones — Lintel
Five GCSE retrieval questions · 12 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
15000000
Answer: 1.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 29°. Find adjacent side
Answer: 21.9cm -
4. Ratio Mixed ratio problems
In ratio 1:4:3, what fraction is the second part?
Answer: 4⁄8 -
5. Statistics Mean
Calculate the mean of: 16, 8, 38, 10, 49, 12, 42
Answer: 25