Keystones — Lintel
Five GCSE retrieval questions · 17 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00087
Answer: 8.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 35°. Find opposite
Answer: 18.9cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:8
Answer: 3:5:4 -
5. Statistics Mean
Calculate the mean of: 11, 17, 21, 19, 25, 5
Answer: 16.3