Keystones — Lintel
Five GCSE retrieval questions · 2 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
54000000
Answer: 5.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 40°. Find opposite
Answer: 14.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 47, 16, 21, 7, 45, 23, 48, 22
Answer: 28.6