Keystones — Lintel
Five GCSE retrieval questions · 29 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00038
Answer: 3.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 9
Answer: (x - 3)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 38°. Find adjacent side
Answer: 28.4cm -
4. Ratio Mixed ratio problems
Simplify: 16:20:16
Answer: 4:5:4 -
5. Statistics Mean
Calculate the mean of: 18, 36, 44, 27, 8, 36, 17, 49
Answer: 29.4