Keystones — Lintel
Five GCSE retrieval questions · 29 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00095
Answer: 9.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 44°. Find adjacent side
Answer: 18cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 49, 43, 9, 23, 31, 35, 8
Answer: 28.3