Keystones — Lintel
Five GCSE retrieval questions · 13 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.005
Answer: 5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 36°. Find adjacent side
Answer: 17cm -
4. Ratio Mixed ratio problems
Divide 140 in the ratio 4:2:1
Answer: 80, 40 and 20 -
5. Statistics Mean
Calculate the mean of: 28, 46, 34, 20, 43, 31, 5, 28
Answer: 29.4