Keystones — Lintel
Five GCSE retrieval questions · 30 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00047
Answer: 4.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 59°. Find adjacent side
Answer: 15.5cm -
4. Ratio Mixed ratio problems
Simplify: 8:24:20
Answer: 2:6:5 -
5. Statistics Mean
Calculate the mean of: 14, 48, 27, 13, 28, 20, 42
Answer: 27.4