Keystones — Lintel
Five GCSE retrieval questions · 12 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
95000000
Answer: 9.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 40°. Find opposite
Answer: 14.3cm -
4. Ratio Mixed ratio problems
In ratio 1:1:3, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
Calculate the mean of: 5, 18, 47, 50, 41, 34
Answer: 32.5