Keystones — Lintel
Five GCSE retrieval questions · 23 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00094
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 35°. Find adjacent side
Answer: 22.9cm -
4. Ratio Mixed ratio problems
£154.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £66.00 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 36, 18, 47, 32, 27, what is the missing number?
Answer: 62