Keystones — Lintel
Five GCSE retrieval questions · 4 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.078
Answer: 7.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 65°. Find adjacent side
Answer: 12.7cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 2:4:1
Answer: 32, 64 and 16 -
5. Statistics Mean
Calculate the mean of: 11, 44, 33, 31, 11, 12
Answer: 23.7