Keystones Lintel — 3 November 2025

Keystones — Lintel

Five GCSE retrieval questions · 3 November 2025 · mathsvault.uk/keystones

1. Number Converting to standard form

160000

Answer: 1.6 × 10⁵
2. Algebra Factorising monic quadratics

Factorise: x² + x - 12

Answer: (x + 4)(x - 3)
3. Geometry SOHCAHTOA — missing length

Adjacent = 15cm, angle = 35°. Find opposite

Answer: 10.5cm
4. Ratio Mixed ratio problems

Simplify: 18:15:18

Answer: 6:5:6
5. Statistics Mean

Calculate the mean of: 45, 6, 41, 30, 17, 24

Answer: 27.2

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