Keystones — Lintel
Five GCSE retrieval questions · 30 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
1800000
Answer: 1.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 29°. Find adjacent side
Answer: 23.6cm -
4. Ratio Mixed ratio problems
In ratio 1:3:3, what fraction is the second part?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 36, 37, 48, what is the missing number?
Answer: 35