Keystones — Lintel
Five GCSE retrieval questions · 6 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
1700000
Answer: 1.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 59°. Find adjacent side
Answer: 19.cm -
4. Ratio Mixed ratio problems
In ratio 1:2:3, what fraction is the second part?
Answer: 2⁄6 -
5. Statistics Mean
The mean of 6 numbers is 20. If 5 of them are 31, 46, 37, 19, 36, what is the missing number?
Answer: -49