Keystones — Lintel
Five GCSE retrieval questions · 4 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.093
Answer: 9.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 38°. Find adjacent side
Answer: 15.8cm -
4. Ratio Mixed ratio problems
Express the first part of 3:4 as a fraction in simplest form
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 34, 16, 27, 41, 50, 5, 50
Answer: 31.9