Keystones — Lintel
Five GCSE retrieval questions · 18 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
460000
Answer: 4.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 49°. Find opposite
Answer: 27.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 27, 26, 50, 19, 31, 19, 46
Answer: 31.1