Keystones — Lintel
Five GCSE retrieval questions · 3 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
59000000
Answer: 5.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 45°. Find opposite
Answer: 27cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 46, 30, 17, 10, 23, 25, 8
Answer: 22.7