Keystones — Lintel
Five GCSE retrieval questions · 1 September 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
140000
Answer: 1.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 50°. Find opposite
Answer: 19.cm -
4. Ratio Mixed ratio problems
£261.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £116.00 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 37, 40, 18, 45, 25, what is the missing number?
Answer: -39