Keystones — Lintel
Five GCSE retrieval questions · 7 April 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
3900000
Answer: 3.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 38°. Find opposite
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Simplify: 15:15:9
Answer: 5:5:3 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 32, 31, 39, 31, what is the missing number?
Answer: 62