Keystones — Lintel
Five GCSE retrieval questions · 31 January 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00017
Answer: 1.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 49°. Find adjacent side
Answer: 20.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 17, 12, 8, 28, 9, 26
Answer: 16.7