Keystones — Lintel
Five GCSE retrieval questions · 5 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.085
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 36°. Find adjacent side
Answer: 12.9cm -
4. Ratio Mixed ratio problems
Divide 98 in the ratio 3:2:2
Answer: 42, 28 and 28 -
5. Statistics Mean
Calculate the mean of: 50, 8, 24, 13, 34, 35
Answer: 27.3