Keystones — Lintel
Five GCSE retrieval questions · 25 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0057
Answer: 5.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 54°. Find opposite
Answer: 26.2cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:6
Answer: 1:2:1 -
5. Statistics Mean
Calculate the mean of: 38, 27, 18, 47, 38, 33, 34, 11
Answer: 30.8