Keystones — Lintel
Five GCSE retrieval questions · 2 September 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.05
Answer: 5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 42°. Find adjacent side
Answer: 12.6cm -
4. Ratio Mixed ratio problems
In ratio 2:3:3, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 24, 34, 50, 29, 40, what is the missing number?
Answer: -3