Keystones — Lintel
Five GCSE retrieval questions · 23 October 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
7100000
Answer: 7.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 28°. Find adjacent side
Answer: 31.8cm -
4. Ratio Mixed ratio problems
Simplify: 20:20:16
Answer: 5:5:4 -
5. Statistics Mean
Calculate the mean of: 50, 26, 40, 23, 47, 42
Answer: 38