Keystones — Lintel
Five GCSE retrieval questions · 8 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0001
Answer: 1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 38°. Find opposite
Answer: 15.6cm -
4. Ratio Mixed ratio problems
Express the first part of 4:6 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 5, 30, 29, 7, 42, 42
Answer: 25.8