Keystones — Lintel
Five GCSE retrieval questions · 21 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.029
Answer: 2.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 58°. Find adjacent side
Answer: 13.2cm -
4. Ratio Mixed ratio problems
In ratio 4:1:3, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
Calculate the mean of: 33, 19, 35, 38, 30, 6
Answer: 26.8