Keystones — Lintel
Five GCSE retrieval questions · 13 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
46000000
Answer: 4.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 53°. Find adjacent side
Answer: 13.2cm -
4. Ratio Mixed ratio problems
In ratio 3:4:3, what fraction is the second part?
Answer: 4⁄10 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 46, 22, 49, 30, 48, what is the missing number?
Answer: -69