Keystones — Lintel
Five GCSE retrieval questions · 7 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
7800000
Answer: 7.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite
Answer: 15.3cm -
4. Ratio Mixed ratio problems
£392.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £245.00 -
5. Statistics Mean
Calculate the mean of: 28, 49, 14, 27, 20, 24, 43, 37
Answer: 30.3