Keystones — Lintel
Five GCSE retrieval questions · 14 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00024
Answer: 2.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 37°. Find opposite
Answer: 11.3cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 35, 33, 6, 15, 37, 39, 34, 24
Answer: 27.9