Keystones — Lintel
Five GCSE retrieval questions · 22 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
9800000
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 29°. Find adjacent side
Answer: 27.cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 3:2:3
Answer: 60, 40 and 60 -
5. Statistics Mean
Calculate the mean of: 47, 9, 24, 20, 50, 20, 18
Answer: 26.9