Keystones — Lintel
Five GCSE retrieval questions · 15 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
79000
Answer: 7.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 52°. Find adjacent side
Answer: 14.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 17, 23, 36, 16, 20, 50, 11, 7
Answer: 22.5