Keystones — Lintel
Five GCSE retrieval questions · 6 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
34000
Answer: 3.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 43°. Find opposite
Answer: 24.2cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:9
Answer: 2:3:3 -
5. Statistics Mean
Calculate the mean of: 14, 19, 36, 13, 13, 22
Answer: 19.5