Keystones — Lintel
Five GCSE retrieval questions · 9 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
36000
Answer: 3.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 60°. Find adjacent side
Answer: 11cm -
4. Ratio Mixed ratio problems
In ratio 4:4:2, what fraction is the second part?
Answer: 4⁄10 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 17, 41, 36, 44, 37, what is the missing number?
Answer: -7