Keystones — Lintel
Five GCSE retrieval questions · 15 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00013
Answer: 1.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 62°. Find adjacent side
Answer: 13.6cm -
4. Ratio Mixed ratio problems
Express the first part of 5:6 as a fraction in simplest form
Answer: 5⁄11 -
5. Statistics Mean
Calculate the mean of: 21, 23, 17, 14, 30, 21, 41
Answer: 23.9