Keystones — Lintel
Five GCSE retrieval questions · 12 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0023
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 30°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Divide 161 in the ratio 3:3:1
Answer: 69, 69 and 23 -
5. Statistics Mean
Calculate the mean of: 26, 25, 7, 31, 48, 8, 12, 5
Answer: 20.3