Keystones — Lintel
Five GCSE retrieval questions · 28 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00056
Answer: 5.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 54°. Find opposite
Answer: 27.5cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:16
Answer: 3:5:4 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 26, 27, 42, 29, what is the missing number?
Answer: 66