Keystones — Lintel
Five GCSE retrieval questions · 10 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.038
Answer: 3.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 50°. Find adjacent side
Answer: 14.8cm -
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: 22, 15, 7, 49, 38, 28, 38
Answer: 28.1