Keystones — Lintel
Five GCSE retrieval questions · 9 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
54000000
Answer: 5.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 58°. Find opposite
Answer: 48cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 39, 6, 45, 23, 23, 35
Answer: 28.5