Keystones — Lintel
Five GCSE retrieval questions · 14 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
2400000
Answer: 2.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 34°. Find adjacent side
Answer: 19.cm -
4. Ratio Mixed ratio problems
Divide 232 in the ratio 3:1:4
Answer: 87, 29 and 116 -
5. Statistics Mean
Calculate the mean of: 12, 15, 37, 25, 30, 9, 13
Answer: 20.1