Keystones — Lintel
Five GCSE retrieval questions · 4 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
2300000
Answer: 2.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 49°. Find adjacent side
Answer: 24.9cm -
4. Ratio Mixed ratio problems
Divide 192 in the ratio 2:1:1
Answer: 96, 48 and 48 -
5. Statistics Mean
Calculate the mean of: 16, 14, 34, 26, 34, 21
Answer: 24.2