Keystones — Lintel
Five GCSE retrieval questions · 18 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.029
Answer: 2.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 42°. Find opposite
Answer: 16.2cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:18
Answer: 2:3:6 -
5. Statistics Mean
Calculate the mean of: 13, 29, 42, 47, 15, 32, 18
Answer: 28