Keystones — Lintel
Five GCSE retrieval questions · 11 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.091
Answer: 9.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 51°. Find adjacent side
Answer: 14.5cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:16
Answer: 2:3:2 -
5. Statistics Mean
Calculate the mean of: 7, 31, 17, 7, 19, 13, 24
Answer: 16.9