Keystones — Lintel
Five GCSE retrieval questions · 3 September 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
260000
Answer: 2.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 52°. Find opposite
Answer: 19.2cm -
4. Ratio Mixed ratio problems
In ratio 4:4:3, what fraction is the second part?
Answer: 4⁄11 -
5. Statistics Mean
Calculate the mean of: 9, 44, 24, 41, 38, 16
Answer: 28.7