Keystones — Lintel
Five GCSE retrieval questions · 16 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.005
Answer: 5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 54°. Find opposite
Answer: 39.9cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:8
Answer: 3:2:2 -
5. Statistics Mean
Calculate the mean of: 49, 9, 43, 48, 44, 10
Answer: 33.8