Keystones — Lintel
Five GCSE retrieval questions · 9 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00061
Answer: 6.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 38°. Find opposite
Answer: 13.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 6, 17, 41, 7, 40, 12, 23
Answer: 20.9