Keystones — Lintel
Five GCSE retrieval questions · 29 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00032
Answer: 3.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 59°. Find opposite
Answer: 38.3cm -
4. Ratio Mixed ratio problems
In ratio 4:1:4, what fraction is the second part?
Answer: 1⁄9 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 40, 48, 44, what is the missing number?
Answer: 16