Keystones — Lintel
Five GCSE retrieval questions · 30 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00098
Answer: 9.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 35°. Find opposite
Answer: 18.2cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 45, 30, 31, 39, 43, 38, 40, 34
Answer: 37.5