Keystones — Lintel
Five GCSE retrieval questions · 11 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
8600000
Answer: 8.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 31°. Find adjacent side
Answer: 33.4cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
Calculate the mean of: 43, 42, 28, 13, 21, 30, 37
Answer: 30.6