Keystones — Lintel
Five GCSE retrieval questions · 12 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
9400000
Answer: 9.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 33°. Find opposite
Answer: 18.8cm -
4. Ratio Mixed ratio problems
Divide 231 in the ratio 4:4:3
Answer: 84, 84 and 63 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 17, 17, 37, what is the missing number?
Answer: 21