Keystones — Lintel
Five GCSE retrieval questions · 10 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
22000
Answer: 2.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 55°. Find opposite
Answer: 24.3cm -
4. Ratio Mixed ratio problems
In ratio 1:3:1, what fraction is the second part?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 26, 29, 44, 27, 22, what is the missing number?
Answer: -16