Keystones — Lintel
Five GCSE retrieval questions · 18 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0027
Answer: 2.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 46°. Find opposite
Answer: 21.7cm -
4. Ratio Mixed ratio problems
In ratio 1:3:3, what fraction is the second part?
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 35, 16, 23, 12, 31, 10
Answer: 21.2