Keystones — Lintel
Five GCSE retrieval questions · 15 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
68000000
Answer: 6.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 37°. Find opposite
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 34, 11, 5, 36, 40, 6, 46
Answer: 25.4