Keystones — Lintel
Five GCSE retrieval questions · 9 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
65000000
Answer: 6.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 60°. Find opposite
Answer: 48.5cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:15
Answer: 5:4:5 -
5. Statistics Mean
Calculate the mean of: 41, 15, 40, 41, 26, 31
Answer: 32.3