Keystones — Lintel
Five GCSE retrieval questions · 3 January 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
8100000
Answer: 8.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 43°. Find opposite
Answer: 27cm -
4. Ratio Mixed ratio problems
£210.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £126.00 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 21, 44, 44, 43, what is the missing number?
Answer: -42