Keystones — Lintel
Five GCSE retrieval questions · 13 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.059
Answer: 5.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 33°. Find opposite
Answer: 18.2cm -
4. Ratio Mixed ratio problems
Divide 140 in the ratio 1:3:1
Answer: 28, 84 and 28 -
5. Statistics Mean
Calculate the mean of: 16, 5, 43, 25, 41, 14
Answer: 24