Keystones — Lintel
Five GCSE retrieval questions · 10 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
7900000
Answer: 7.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 58°. Find opposite
Answer: 38.4cm -
4. Ratio Mixed ratio problems
Express the first part of 3:4 as a fraction in simplest form
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 8, 44, 19, 43, 48, 32
Answer: 32.3