Keystones — Lintel
Five GCSE retrieval questions · 21 October 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
470000
Answer: 4.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 43°. Find adjacent side
Answer: 13.9cm -
4. Ratio Mixed ratio problems
Simplify: 12:9:12
Answer: 4:3:4 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 18, 42, 35, what is the missing number?
Answer: -11