Keystones — Lintel
Five GCSE retrieval questions · 17 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
67000
Answer: 6.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 33°. Find opposite
Answer: 18.8cm -
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 29. If 3 of them are 34, 35, 26, what is the missing number?
Answer: 21