Keystones — Lintel
Five GCSE retrieval questions · 13 July 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
12000
Answer: 1.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 36°. Find opposite
Answer: 21.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 15, 38, 13, 45, 25, 10, 16, 9
Answer: 21.4