Keystones — Lintel
Five GCSE retrieval questions · 20 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0065
Answer: 6.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 31°. Find opposite
Answer: 10.2cm -
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: 9, 39, 32, 36, 22, 7, 13, 38
Answer: 24.5