Keystones — Lintel
Five GCSE retrieval questions · 21 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00052
Answer: 5.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 47°. Find opposite
Answer: 23.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 44, 28, 10, 49, 34, 39, 43
Answer: 35.3