Keystones — Lintel
Five GCSE retrieval questions · 2 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
18000000
Answer: 1.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 35°. Find opposite
Answer: 7.7cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 2:3:1
Answer: 36, 54 and 18 -
5. Statistics Mean
Calculate the mean of: 12, 42, 8, 34, 9, 19, 26
Answer: 21.4