Keystones — Lintel
Five GCSE retrieval questions · 17 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
3600000
Answer: 3.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 52°. Find opposite
Answer: 35.8cm -
4. Ratio Mixed ratio problems
In ratio 4:2:2, what fraction is the second part?
Answer: 2⁄8 -
5. Statistics Mean
Calculate the mean of: 8, 39, 27, 29, 7, 44, 43
Answer: 28.1