Keystones — Lintel
Five GCSE retrieval questions · 17 February 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
43000
Answer: 4.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 30°. Find opposite
Answer: 6.9cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:8
Answer: 3:6:4 -
5. Statistics Mean
Calculate the mean of: 28, 48, 42, 50, 16, 31, 6
Answer: 31.6