Keystones — Lintel
Five GCSE retrieval questions · 12 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.017
Answer: 1.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 44°. Find opposite
Answer: 9.7cm -
4. Ratio Mixed ratio problems
In ratio 2:4:1, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 39, 36, 41, 11, 13, 28, 22, 28
Answer: 27.3