Keystones — Lintel
Five GCSE retrieval questions · 18 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
40000
Answer: 4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 50°. Find opposite
Answer: 35.8cm -
4. Ratio Mixed ratio problems
Divide 60 in the ratio 4:1:1
Answer: 40, 10 and 10 -
5. Statistics Mean
Calculate the mean of: 34, 29, 47, 30, 13, 49
Answer: 33.7