Keystones — Lintel
Five GCSE retrieval questions · 15 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
640000
Answer: 6.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 33°. Find adjacent side
Answer: 18.5cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:18
Answer: 3:4:6 -
5. Statistics Mean
Calculate the mean of: 35, 29, 5, 13, 35, 11
Answer: 21.3