Keystones — Lintel
Five GCSE retrieval questions · 24 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.08
Answer: 8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 32°. Find adjacent side
Answer: 33.cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 3:3:4
Answer: 66, 66 and 88 -
5. Statistics Mean
Calculate the mean of: 23, 11, 12, 26, 35, 43, 16, 20
Answer: 23.3