Keystones — Lintel
Five GCSE retrieval questions · 5 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.085
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 54°. Find opposite
Answer: 38.5cm -
4. Ratio Mixed ratio problems
In ratio 2:3:2, what fraction is the second part?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 23, 42, 48, 40, 27, what is the missing number?
Answer: 6