Keystones — Lintel
Five GCSE retrieval questions · 17 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0054
Answer: 5.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 45°. Find opposite
Answer: 10cm -
4. Ratio Mixed ratio problems
In ratio 2:2:1, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 24, 50, 17, 8, 49, 13
Answer: 26.8