Keystones — Lintel
Five GCSE retrieval questions · 16 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.019
Answer: 1.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 39°. Find opposite
Answer: 18.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 38, 36, 28, 26, 5, 37
Answer: 28.3