Keystones — Lintel
Five GCSE retrieval questions · 8 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.016
Answer: 1.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 27°. Find adjacent side
Answer: 24.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 24, 28, 20, what is the missing number?
Answer: 24