Keystones — Lintel
Five GCSE retrieval questions · 10 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0017
Answer: 1.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 50°. Find adjacent side
Answer: 25.7cm -
4. Ratio Mixed ratio problems
Express the first part of 4:3 as a fraction in simplest form
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 17, 32, 42, 14, 13, 18, 41, 45
Answer: 27.8