Keystones — Lintel
Five GCSE retrieval questions · 23 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00058
Answer: 5.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 26°. Find adjacent side
Answer: 16.2cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
Calculate the mean of: 23, 39, 17, 24, 36, 42, 37, 50
Answer: 33.5