Keystones — Lintel
Five GCSE retrieval questions · 2 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0065
Answer: 6.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 50°. Find adjacent side
Answer: 25.7cm -
4. Ratio Mixed ratio problems
£130.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £52.00 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 19, 36, 45, what is the missing number?
Answer: 28