Keystones — Lintel
Five GCSE retrieval questions · 20 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
57000000
Answer: 5.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 49°. Find opposite
Answer: 29.9cm -
4. Ratio Mixed ratio problems
£405.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £225.00 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 49, 39, 31, 21, what is the missing number?
Answer: -5