Keystones — Lintel
Five GCSE retrieval questions · 25 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
98000
Answer: 9.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 50°. Find adjacent side
Answer: 17.4cm -
4. Ratio Mixed ratio problems
Simplify: 20:12:24
Answer: 5:3:6 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 21, 28, 32, what is the missing number?
Answer: 51