Keystones — Lintel
Five GCSE retrieval questions · 31 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
75000
Answer: 7.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 60°. Find adjacent side
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Simplify: 6:15:6
Answer: 2:5:2 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 44, 27, 36, what is the missing number?
Answer: 13