Keystones — Lintel
Five GCSE retrieval questions · 30 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00084
Answer: 8.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 40°. Find adjacent side
Answer: 23cm -
4. Ratio Mixed ratio problems
In ratio 1:1:2, what fraction is the second part?
Answer: 1⁄4 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 18, 44, 42, what is the missing number?
Answer: 56