Keystones — Lintel
Five GCSE retrieval questions · 15 July 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00024
Answer: 2.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 44°. Find adjacent side
Answer: 27.3cm -
4. Ratio Mixed ratio problems
Divide 40 in the ratio 1:2:1
Answer: 10, 20 and 10 -
5. Statistics Mean
Calculate the mean of: 6, 16, 32, 9, 36, 45, 31
Answer: 25