Keystones — Lintel
Five GCSE retrieval questions · 21 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
56000
Answer: 5.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 38°. Find opposite
Answer: 7.8cm -
4. Ratio Mixed ratio problems
In ratio 3:2:1, what fraction is the second part?
Answer: 2⁄6 -
5. Statistics Mean
Calculate the mean of: 42, 37, 25, 38, 9, 44, 39, 38
Answer: 34