Keystones — Lintel
Five GCSE retrieval questions · 27 January 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.031
Answer: 3.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 41°. Find opposite
Answer: 22.6cm -
4. Ratio Mixed ratio problems
In ratio 2:4:3, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
Calculate the mean of: 48, 19, 39, 44, 33, 27, 33, 28
Answer: 33.9