Keystones — Lintel
Five GCSE retrieval questions · 24 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00027
Answer: 2.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 45°. Find opposite
Answer: 18cm -
4. Ratio Mixed ratio problems
Divide 203 in the ratio 4:2:1
Answer: 116, 58 and 29 -
5. Statistics Mean
Calculate the mean of: 47, 20, 8, 19, 29, 6
Answer: 21.5