Keystones — Lintel
Five GCSE retrieval questions · 20 October 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0036
Answer: 3.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 55°. Find opposite
Answer: 32.8cm -
4. Ratio Mixed ratio problems
Divide 225 in the ratio 4:2:3
Answer: 100, 50 and 75 -
5. Statistics Mean
Calculate the mean of: 47, 11, 37, 36, 13, 46, 19
Answer: 29.9